{"items":[{"id":"NVI-00006586","kind":"vulnerability","title":"Grav: XSS Blueprint Validation Bypass via Twig String Concatenation","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-2c4f-86xc-cr74","CVE-2026-61453"],"plain_summary":"OSV carries this publisher advisory for getgrav/grav. 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 2.0.1 for getgrav/grav. Confirm the publisher’s latest guidance.","source_ids":["sr-baa3ba96618819ffe8d2e2ba1a1fbcd2"],"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-021916f12dca6cef60f9e2b974352fc0"],"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":"2026-10-08T16:17:25.220Z","value":"6.1 MEDIUM (3.1)","meaning":"disclosure@vulncheck.com severity; no combined Null risk score.","source_id":"sr-4c048b339c9a28eabfcd22587fc5cd32"},{"kind":"CVSS","as_of":"2026-10-08T16:17:25.220Z","value":"5.1 MEDIUM (4.0)","meaning":"disclosure@vulncheck.com severity; no combined Null risk score.","source_id":"sr-4c048b339c9a28eabfcd22587fc5cd32"},{"kind":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.196%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.09336. Missing scores are unknown.","source_id":"sr-021916f12dca6cef60f9e2b974352fc0"}],"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-baa3ba96618819ffe8d2e2ba1a1fbcd2","url":"https://github.com/advisories/GHSA-2c4f-86xc-cr74","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-2c4f-86xc-cr74","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:41:40.014Z"},{"id":"sr-4c048b339c9a28eabfcd22587fc5cd32","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61453","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-61453","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T07:24:49.802Z"},{"id":"sr-021916f12dca6cef60f9e2b974352fc0","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-2026-61453","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:44:07.789Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-baa3ba96618819ffe8d2e2ba1a1fbcd2"],"technology":"getgrav/grav","known_exclusions":[],"conditions_summary":"## Summary\n\nThe XSS blueprint validator (`Security::detectXss()`) runs on the **raw page content before Twig processing**. An attacker can use Twig's string concatenation operator (`~`) to dynamically construct an event handler name at render time. The validator sees `{{ \"on\" ~ \"error\" }}` - a harmless Twig expression - and allows the content. After Twig processes the template, the output contains `` which is rendered via `{{ content|raw }}` and executes in the victim's browser.\n\n---\n\n## Details\n\n**The two-stage attack** exploits the separation between validation and rendering:\n\n**Stage 1 - what the XSS validator sees** (raw page content):\n\n```twig\n{% set x = \"on\" ~ \"error\" %}\n\n```\n\nThe `detectXss()` function scans this string. The `on_events` regex looks for `]*?\\s\\x00-\\x20\\\"\\'\\/\\s*=` inside HTML tags. In `{{ x }}`, the `{` character is not in the boundary set `[\\s\\x00-\\x20\\\"\\'\\/]`, and `x` is not `on`. **No match - passes validation.**\n\n**Stage 2 - what Twig produces** (after rendering):\n\n```html\n\n```\n\nThe validator never re-inspects Twig output","public_affected_ranges":["ECOSYSTEM: introduced 2.0.0; fixed 2.0.1"]}],"null_published_at":"2026-11-04T10:04:41.534Z","source_updated_at":"2026-09-16T22:30:08.125Z","source_disclosed_at":"2026-09-16T22:13:17.000Z","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":"2026-10-31T21:41:40.014Z"},{"id":"NVI-00006586","kind":"vulnerability","title":"Grav: XSS Blueprint Validation Bypass via Twig String Concatenation","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-2c4f-86xc-cr74","CVE-2026-61453"],"plain_summary":"OSV carries this publisher advisory for getgrav/grav. 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 2.0.1 for getgrav/grav. Confirm the publisher’s latest guidance.","source_ids":["sr-baa3ba96618819ffe8d2e2ba1a1fbcd2"],"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-037413eb5cfaf89371bd1b9cd6ff7edb"],"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":"2026-10-08T16:17:25.220Z","value":"6.1 MEDIUM (3.1)","meaning":"disclosure@vulncheck.com severity; no combined Null risk score.","source_id":"sr-4c048b339c9a28eabfcd22587fc5cd32"},{"kind":"CVSS","as_of":"2026-10-08T16:17:25.220Z","value":"5.1 MEDIUM (4.0)","meaning":"disclosure@vulncheck.com severity; no combined Null risk score.","source_id":"sr-4c048b339c9a28eabfcd22587fc5cd32"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.196%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.09299. Missing scores are unknown.","source_id":"sr-037413eb5cfaf89371bd1b9cd6ff7edb"}],"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-baa3ba96618819ffe8d2e2ba1a1fbcd2","url":"https://github.com/advisories/GHSA-2c4f-86xc-cr74","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-2c4f-86xc-cr74","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:41:40.014Z"},{"id":"sr-4c048b339c9a28eabfcd22587fc5cd32","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61453","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-61453","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-01T07:24:49.802Z"},{"id":"sr-037413eb5cfaf89371bd1b9cd6ff7edb","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-2026-61453","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.383Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-baa3ba96618819ffe8d2e2ba1a1fbcd2"],"technology":"getgrav/grav","known_exclusions":[],"conditions_summary":"## Summary\n\nThe XSS blueprint validator (`Security::detectXss()`) runs on the **raw page content before Twig processing**. An attacker can use Twig's string concatenation operator (`~`) to dynamically construct an event handler name at render time. The validator sees `{{ \"on\" ~ \"error\" }}` - a harmless Twig expression - and allows the content. After Twig processes the template, the output contains `` which is rendered via `{{ content|raw }}` and executes in the victim's browser.\n\n---\n\n## Details\n\n**The two-stage attack** exploits the separation between validation and rendering:\n\n**Stage 1 - what the XSS validator sees** (raw page content):\n\n```twig\n{% set x = \"on\" ~ \"error\" %}\n\n```\n\nThe `detectXss()` function scans this string. The `on_events` regex looks for `]*?\\s\\x00-\\x20\\\"\\'\\/\\s*=` inside HTML tags. In `{{ x }}`, the `{` character is not in the boundary set `[\\s\\x00-\\x20\\\"\\'\\/]`, and `x` is not `on`. **No match - passes validation.**\n\n**Stage 2 - what Twig produces** (after rendering):\n\n```html\n\n```\n\nThe validator never re-inspects Twig output","public_affected_ranges":["ECOSYSTEM: introduced 2.0.0; fixed 2.0.1"]}],"null_published_at":"2026-11-01T14:34:07.651Z","source_updated_at":"2026-09-16T22:30:08.125Z","source_disclosed_at":"2026-09-16T22:13:17.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:41:40.014Z"},{"id":"NVI-00006586","kind":"vulnerability","title":"Grav: XSS Blueprint Validation Bypass via Twig String Concatenation","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-2c4f-86xc-cr74","CVE-2026-61453"],"plain_summary":"OSV carries this publisher advisory for getgrav/grav. 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 2.0.1 for getgrav/grav. Confirm the publisher’s latest guidance.","source_ids":["sr-baa3ba96618819ffe8d2e2ba1a1fbcd2"],"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-037413eb5cfaf89371bd1b9cd6ff7edb"],"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":"0.196%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.09299. Missing scores are unknown.","source_id":"sr-037413eb5cfaf89371bd1b9cd6ff7edb"}],"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-baa3ba96618819ffe8d2e2ba1a1fbcd2","url":"https://github.com/advisories/GHSA-2c4f-86xc-cr74","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-2c4f-86xc-cr74","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:41:40.014Z"},{"id":"sr-037413eb5cfaf89371bd1b9cd6ff7edb","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-2026-61453","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.383Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-baa3ba96618819ffe8d2e2ba1a1fbcd2"],"technology":"getgrav/grav","known_exclusions":[],"conditions_summary":"## Summary\n\nThe XSS blueprint validator (`Security::detectXss()`) runs on the **raw page content before Twig processing**. An attacker can use Twig's string concatenation operator (`~`) to dynamically construct an event handler name at render time. The validator sees `{{ \"on\" ~ \"error\" }}` - a harmless Twig expression - and allows the content. After Twig processes the template, the output contains `` which is rendered via `{{ content|raw }}` and executes in the victim's browser.\n\n---\n\n## Details\n\n**The two-stage attack** exploits the separation between validation and rendering:\n\n**Stage 1 - what the XSS validator sees** (raw page content):\n\n```twig\n{% set x = \"on\" ~ \"error\" %}\n\n```\n\nThe `detectXss()` function scans this string. The `on_events` regex looks for `]*?\\s\\x00-\\x20\\\"\\'\\/\\s*=` inside HTML tags. In `{{ x }}`, the `{` character is not in the boundary set `[\\s\\x00-\\x20\\\"\\'\\/]`, and `x` is not `on`. **No match - passes validation.**\n\n**Stage 2 - what Twig produces** (after rendering):\n\n```html\n\n```\n\nThe validator never re-inspects Twig output","public_affected_ranges":["ECOSYSTEM: introduced 2.0.0; fixed 2.0.1"]}],"null_published_at":"2026-10-31T22:13:44.217Z","source_updated_at":"2026-09-16T22:30:08.125Z","source_disclosed_at":"2026-09-16T22:13:17.000Z","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":"2026-10-31T21:41:40.014Z"}],"next_cursor":null,"snapshot_revision":"42594"}