CVE-2026-84371
Medium · CVSS 5.4Published 2026-09-01
CVSS
5.4
Medium
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-84371?
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.
CVSS Score Explained
CVSS 5.4 is Medium severity. Exploitation usually requires some specific conditions (local access, user interaction, or a particular config). Still worth patching in your next maintenance window.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›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
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