{"items":[{"id":"NVI-00012912","kind":"vulnerability","title":"xhtml-purifier has HTML attribute-injection (sanitizer bypass) that leads to XSS","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-j8r4-32c5-33rc","CVE-2026-61784"],"plain_summary":"GitHub lists this reviewed advisory for xhtml-purifier. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-11c76e5dd7c9206b7968f837d95adc06"],"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":"2026-09-24T19:33:25.000Z","value":"6.1 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-05ff1bf3d9ef2b714cc937939e197835"},{"kind":"EPSS","as_of":"2026-11-02T12:00:30.000Z","value":"0.178%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.07323. Missing scores are unknown.","source_id":"sr-11c76e5dd7c9206b7968f837d95adc06"}],"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-05ff1bf3d9ef2b714cc937939e197835","url":"https://github.com/advisories/GHSA-j8r4-32c5-33rc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-j8r4-32c5-33rc","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:52.155Z"},{"id":"sr-11c76e5dd7c9206b7968f837d95adc06","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-2026-61784","publisher":"FIRST EPSS","observed_at":"2026-11-02T20:15:58.859Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-05ff1bf3d9ef2b714cc937939e197835"],"technology":"xhtml-purifier","known_exclusions":[],"conditions_summary":"xhtml-purifier does not HTML-entity-encode attribute values when serializing its sanitized output. In attributeString() (XHTMLPurifier.js, around line 148) the attribute value is concatenated directly into a double-quoted attribute without encoding. As a result, an attacker-controlled value in any allowed attribute (class, style, title, alt, src, href) can include a double-quote character to break out of the attribute and inject an additional attribute, such as a JavaScript event handler (for example onmouseover or onerror). The injected handler survives sanitization and executes when the output is rendered, which is a sanitizer bypass leading to cross-site scripting. The fix HTML-entity-encodes attribute values before serialization.","public_affected_ranges":["<= 0.4.1"]}],"null_published_at":"2026-11-04T10:04:47.609Z","source_updated_at":"2026-09-24T19:33:25.000Z","source_disclosed_at":"2026-09-24T19:33:23.000Z","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":"2026-11-01T07:24:52.155Z"},{"id":"NVI-00012912","kind":"vulnerability","title":"xhtml-purifier has HTML attribute-injection (sanitizer bypass) that leads to XSS","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-j8r4-32c5-33rc","CVE-2026-61784"],"plain_summary":"GitHub lists this reviewed advisory for xhtml-purifier. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-05ff1bf3d9ef2b714cc937939e197835"],"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":"2026-09-24T19:33:25.000Z","value":"6.1 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-05ff1bf3d9ef2b714cc937939e197835"}],"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-05ff1bf3d9ef2b714cc937939e197835","url":"https://github.com/advisories/GHSA-j8r4-32c5-33rc","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-j8r4-32c5-33rc","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T07:24:52.155Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-05ff1bf3d9ef2b714cc937939e197835"],"technology":"xhtml-purifier","known_exclusions":[],"conditions_summary":"xhtml-purifier does not HTML-entity-encode attribute values when serializing its sanitized output. In attributeString() (XHTMLPurifier.js, around line 148) the attribute value is concatenated directly into a double-quoted attribute without encoding. As a result, an attacker-controlled value in any allowed attribute (class, style, title, alt, src, href) can include a double-quote character to break out of the attribute and inject an additional attribute, such as a JavaScript event handler (for example onmouseover or onerror). The injected handler survives sanitization and executes when the output is rendered, which is a sanitizer bypass leading to cross-site scripting. The fix HTML-entity-encodes attribute values before serialization.","public_affected_ranges":["<= 0.4.1"]}],"null_published_at":"2026-11-01T07:29:12.901Z","source_updated_at":"2026-09-24T19:33:25.000Z","source_disclosed_at":"2026-09-24T19:33:23.000Z","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":"2026-11-01T07:24:52.155Z"}],"next_cursor":null,"snapshot_revision":"42594"}