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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.","state":0,"publishedAt":"2026-09-01T20:51:10.441+00:00","modifiedAt":"2026-09-02T16:02:13.385+00:00","affected":[{"ecosystem":"Vendor product","name":"apostrophe","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"vendor\": \"apostrophecms\",\n \"product\": \"apostrophe\",\n \"versions\": [\n {\n \"version\": \">= 1.9.0, < 2.17.7\",\n \"status\": \"affected\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4,"severity":"MEDIUM"}],"references":["https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-g8qq-57p8-ggw5","https://github.com/apostrophecms/apostrophe/pull/5552","https://github.com/apostrophecms/apostrophe/commit/1135516a1a4a8f9638641c460488a43d8af20081","https://github.com/apostrophecms/apostrophe/commit/38ff1106c8176b16c2da9872acd9b449adcbb949","https://github.com/apostrophecms/apostrophe/blob/main/packages/sanitize-html/CHANGELOG.md"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-84371","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-84371","identifiers":["CVE-2026-84371"]},"retained":false,"historicalAffected":[]},{"revision":"f574a2b3abc94e6e9be047b935e58bd4","observedAt":"2026-11-13T18:03:02.319+00:00","statement":{"source":"euvd","id":"EUVD-2026-69654","aliases":["CVE-2026-84371","GHSA-g8qq-57p8-ggw5"],"title":"ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. 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This issue is fixed in version 2.17.7.","state":0,"publishedAt":"2026-09-01T21:18:48.357+00:00","modifiedAt":"2026-09-09T21:09:13.08+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4,"severity":"MEDIUM"}],"references":["https://github.com/apostrophecms/apostrophe/blob/main/packages/sanitize-html/CHANGELOG.md","https://github.com/apostrophecms/apostrophe/commit/1135516a1a4a8f9638641c460488a43d8af20081","https://github.com/apostrophecms/apostrophe/commit/38ff1106c8176b16c2da9872acd9b449adcbb949","https://github.com/apostrophecms/apostrophe/pull/5552","https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-g8qq-57p8-ggw5"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84371","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-79"],"productCriteria":[],"sourceDates":{"published":"2026-09-01T21:18:48.357","lastModified":"2026-09-09T21:09:13.080"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-84371","identifiers":["CVE-2026-84371"]},"retained":false,"historicalAffected":[]},{"revision":"720a12bc22b046978d34dd30042def24","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-g8qq-57p8-ggw5","aliases":["CVE-2026-84371"],"title":"ApostropheCMS: Stored XSS via SVG SMIL URI-list scheme-policy bypass","description":"### Summary\nWhen SVG animation is allowed, `attributeName=\"href\"` makes `values` a list of URL destinations. `sanitize-html` accepts a list that starts with a safe fragment even when `values` is explicitly scheme-checked, allowing a later `javascript:` destination to execute when the sanitized link is activated.\n\n### Details\n`index.js:371-383` validates each attribute as one flat URL. It does not recognize that `attributeName=\"href\"` gives the sibling `values` attribute SMIL URI-list semantics. For `values=\"#safe;javascript:...\"`, the leading fragment passes the flat check and the complete list is retained.\n\n### PoC\nThis was reproduced with `sanitize-html@2.17.6` and Chromium 150.0.7871.124. The configuration adds SVG animation to the defaults and applies the existing scheme policy to `values`; it does not allow `javascript:`. Save this as `poc.js`:\n\n```js\nconst sanitize = require('sanitize-html');\n\nconst input = ``;\nconst output = sanitize(input, {\n allowedTags: sanitize.defaults.allowedTags.concat(['svg', 'animate', 'text']),\n allowedAttributes: {\n ...sanitize.defaults.allowedAttributes,\n animate: ['attributename', 'values', 'dur', 'fill'],\n text: ['y']\n },\n allowedSchemesAppliedToAttributes:\n sanitize.defaults.allowedSchemesAppliedToAttributes.concat(['values'])\n});\nconsole.log(output);\n```\n\nInstall and run it, then open `poc.html` and click `Click me`:\n\n```sh\nnpm install sanitize-html@2.17.6\nnode poc.js > poc.html\n```\n\nThe output retains the `javascript:` entry, and clicking the sanitized SVG displays `XSS`. With `input` changed to `control`, the same configuration removes `href`.\n\n### Impact\nIn an application that accepts attacker-authored SVG animation, the attacker can store this payload without scripts or event handlers. A victim who activates the sanitized link executes JavaScript in the application's origin despite the configured scheme policy.\n\n### Suggested fix\nReject `attributeName` values selecting `href` or `xlink:href` on SVG `animate` and `set`, while retaining safe targets such as `fill`. Add `values`, `from`, and `to` regression cases.","state":0,"publishedAt":"2026-09-01T21:20:01+00:00","modifiedAt":"2026-09-10T03:50:54.4631844+00:00","affected":[{"ecosystem":"npm","name":"sanitize-html","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.9.0"},{"kind":"fixed","version":"2.17.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-g8qq-57p8-ggw5","https://github.com/apostrophecms/apostrophe/pull/5552","https://github.com/apostrophecms/apostrophe/commit/1135516a1a4a8f9638641c460488a43d8af20081","https://github.com/apostrophecms/apostrophe/commit/38ff1106c8176b16c2da9872acd9b449adcbb949","https://github.com/apostrophecms/apostrophe","https://github.com/apostrophecms/apostrophe/blob/main/packages/sanitize-html/CHANGELOG.md"],"sourceUrl":"https://github.com/advisories/GHSA-g8qq-57p8-ggw5","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-g8qq-57p8-ggw5","identifiers":["GHSA-g8qq-57p8-ggw5","CVE-2026-84371"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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