{"id":"CVE-2026-84371","summary":"ApostropheCMS: Stored XSS via SVG SMIL URI-list scheme-policy bypass","details":"ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From version 1.9.0 until version 2.17.7, packages/sanitize-html/index.js validates an animation value attribute as one flat URL and does not recognize that attributeName selecting href or xlink:href gives the sibling values, from, to, or by attribute SVG SMIL URL semantics. In configurations that allow the animate, animateColor, animateMotion, animateTransform, or set elements, a values list can begin with a safe fragment and contain a later executable destination that survives allowedSchemesAppliedToAttributes checking. When the sanitized SVG is rendered, the browser can copy that later destination into the live link, and a victim who activates the link can execute script in the application's origin. This issue is fixed in version 2.17.7.","aliases":["GHSA-g8qq-57p8-ggw5"],"modified":"2026-10-21T03:00:29.335633020Z","published":"2026-09-01T20:51:10.441Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84371.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-79"]},"references":[{"type":"WEB","url":"https://github.com/apostrophecms/apostrophe/blob/main/packages/sanitize-html/CHANGELOG.md"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84371.json"},{"type":"ADVISORY","url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-g8qq-57p8-ggw5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84371"},{"type":"FIX","url":"https://github.com/apostrophecms/apostrophe/commit/1135516a1a4a8f9638641c460488a43d8af20081"},{"type":"FIX","url":"https://github.com/apostrophecms/apostrophe/commit/38ff1106c8176b16c2da9872acd9b449adcbb949"},{"type":"FIX","url":"https://github.com/apostrophecms/apostrophe/pull/5552"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apostrophecms/apostrophe","events":[{"introduced":"c2e454f69e303c35fc6faae9b86332c2467bc3e2"},{"fixed":"72f4531e7b491738049eec423d0c1c2342828e5f"},{"fixed":"1135516a1a4a8f9638641c460488a43d8af20081"},{"fixed":"38ff1106c8176b16c2da9872acd9b449adcbb949"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StringRangeExpression","range":[{"introduced":"1.9.0"},{"fixed":"2.17.7"}]},{"range":[{"fixed":"1135516a1a4a8f9638641c460488a43d8af20081"}],"source":"REFERENCES_COMMIT"},{"range":[{"fixed":"38ff1106c8176b16c2da9872acd9b449adcbb949"}],"source":"REFERENCES_COMMIT"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84371.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"}]}