{"items":[{"id":"NVI-00002288","kind":"vulnerability","title":"Symfony's HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — `javascript`: URI Survives Sanitization (XSS)","revision":4,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-hhg7-c65m-h7ff","CVE-2026-45753"],"plain_summary":"OSV carries this publisher advisory for symfony/html-sanitizer, symfony/html-sanitizer, symfony/html-sanitizer, symfony/symfony, symfony/symfony. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 6.4.40 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.12 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.0.12 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.40 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.0.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-243568df529d5428920abb4d4a8483ec"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-15T13:44:21.307Z","value":"6.1 MEDIUM (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-7cdf7064d51f84b797ceffde9c5c8008"},{"kind":"CVSS","as_of":"2026-07-15T13:44:21.307Z","value":"2.1 LOW (4.0)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-7cdf7064d51f84b797ceffde9c5c8008"},{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.338%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.27273. Missing scores are unknown.","source_id":"sr-243568df529d5428920abb4d4a8483ec"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-127fbca418e68fa472e71459f9600449","url":"https://github.com/advisories/GHSA-hhg7-c65m-h7ff","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-hhg7-c65m-h7ff","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.430Z"},{"id":"sr-7cdf7064d51f84b797ceffde9c5c8008","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45753","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-45753","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T07:24:11.754Z"},{"id":"sr-243568df529d5428920abb4d4a8483ec","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-45753","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.785Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 6.1.0; fixed 6.4.40"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.0.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 6.1.0; fixed 6.4.40"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.0.12"]}],"null_published_at":"2026-11-08T19:53:33.529Z","source_updated_at":"2026-09-10T03:51:06.023Z","source_disclosed_at":"2026-05-28T16:43:27.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:20.430Z"},{"id":"NVI-00002288","kind":"vulnerability","title":"Symfony's HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — `javascript`: URI Survives Sanitization (XSS)","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-hhg7-c65m-h7ff","CVE-2026-45753"],"plain_summary":"OSV carries this publisher advisory for symfony/html-sanitizer, symfony/html-sanitizer, symfony/html-sanitizer, symfony/symfony, symfony/symfony. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 6.4.40 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.12 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.0.12 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.40 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.0.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-2f38eea01efe3de2a23235d6bd894856"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-15T13:44:21.307Z","value":"6.1 MEDIUM (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-7cdf7064d51f84b797ceffde9c5c8008"},{"kind":"CVSS","as_of":"2026-07-15T13:44:21.307Z","value":"2.1 LOW (4.0)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-7cdf7064d51f84b797ceffde9c5c8008"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.338%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.27242. Missing scores are unknown.","source_id":"sr-2f38eea01efe3de2a23235d6bd894856"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-127fbca418e68fa472e71459f9600449","url":"https://github.com/advisories/GHSA-hhg7-c65m-h7ff","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-hhg7-c65m-h7ff","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.430Z"},{"id":"sr-7cdf7064d51f84b797ceffde9c5c8008","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45753","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-45753","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T07:24:11.754Z"},{"id":"sr-2f38eea01efe3de2a23235d6bd894856","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-45753","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.379Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 6.1.0; fixed 6.4.40"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.0.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 6.1.0; fixed 6.4.40"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.0.12"]}],"null_published_at":"2026-11-03T17:49:21.345Z","source_updated_at":"2026-09-10T03:51:06.023Z","source_disclosed_at":"2026-05-28T16:43:27.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:42:20.430Z"},{"id":"NVI-00002288","kind":"vulnerability","title":"Symfony's HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — `javascript`: URI Survives Sanitization (XSS)","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-hhg7-c65m-h7ff","CVE-2026-45753"],"plain_summary":"OSV carries this publisher advisory for symfony/html-sanitizer, symfony/html-sanitizer, symfony/html-sanitizer, symfony/symfony, symfony/symfony. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 6.4.40 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.12 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.0.12 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.40 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.0.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-2f38eea01efe3de2a23235d6bd894856"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.338%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.27242. Missing scores are unknown.","source_id":"sr-2f38eea01efe3de2a23235d6bd894856"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-127fbca418e68fa472e71459f9600449","url":"https://github.com/advisories/GHSA-hhg7-c65m-h7ff","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-hhg7-c65m-h7ff","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.430Z"},{"id":"sr-2f38eea01efe3de2a23235d6bd894856","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-45753","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.379Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 6.1.0; fixed 6.4.40"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.0.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 6.1.0; fixed 6.4.40"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.0.12"]}],"null_published_at":"2026-10-31T22:27:15.280Z","source_updated_at":"2026-09-10T03:51:06.023Z","source_disclosed_at":"2026-05-28T16:43:27.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:20.430Z"},{"id":"NVI-00002288","kind":"vulnerability","title":"Symfony's HtmlSanitizer UrlAttributeSanitizer Omits action/formaction/poster/cite — `javascript`: URI Survives Sanitization (XSS)","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-hhg7-c65m-h7ff","CVE-2026-45753"],"plain_summary":"OSV carries this publisher advisory for symfony/html-sanitizer, symfony/html-sanitizer, symfony/html-sanitizer, symfony/symfony, symfony/symfony. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 6.4.40 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.12 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.0.12 for symfony/html-sanitizer. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 6.4.40 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 7.4.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 8.0.12 for symfony/symfony. Confirm the publisher’s latest guidance.","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-127fbca418e68fa472e71459f9600449","url":"https://github.com/advisories/GHSA-hhg7-c65m-h7ff","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-hhg7-c65m-h7ff","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.430Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 6.1.0; fixed 6.4.40"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/html-sanitizer","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.0.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 6.1.0; fixed 6.4.40"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 7.0.0; fixed 7.4.12"]},{"certainty":"source_listed","source_ids":["sr-127fbca418e68fa472e71459f9600449"],"technology":"symfony/symfony","known_exclusions":[],"conditions_summary":"### Description\n\n`symfony/html-sanitizer` lets applications sanitise untrusted HTML. `UrlAttributeSanitizer` is the visitor responsible for validating URL-valued attributes and stripping dangerous schemes from them; it runs on every element regardless of configuration. Whether an attribute is *kept* is decided by the element/attribute allow-list; validating the *scheme* of a URL attribute is solely `UrlAttributeSanitizer`'s responsibility.\n\n`UrlAttributeSanitizer::getSupportedAttributes()` returned only `['src', 'href', 'lowsrc', 'background', 'ping']`. The HTML URL-valued attributes `action` (``), `formaction` (``, ``), `poster` (``) and `cite` (``, ``, ``, ``) were missing from that list, so `DomVisitor` never invoked scheme validation for them. As a result, when a configuration admits one of those attributes, a `javascript:` URI in it survived sanitisation.\n\n### Conditions for exploitation\n\n`allowSafeElements()` is **not** affected: `` and the `formaction` attribute are both flagged unsafe in `W3CReference`, and `allowElement('form')` resets the element's attribute list. Reaching the vulnerable attributes requ","public_affected_ranges":["ECOSYSTEM: introduced 8.0.0; fixed 8.0.12"]}],"null_published_at":"2026-10-31T22:00:33.872Z","source_updated_at":"2026-09-10T03:51:06.023Z","source_disclosed_at":"2026-05-28T16:43:27.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:42:20.430Z"}],"next_cursor":null,"snapshot_revision":"42594"}