cyfenced.com →

[ CVE-2026-113657 · Published 20 Oct 2026 ]

ApostropheCMS sanitize-html: SMIL animation namespace-prefix bypass allows javascript: URI injection (XSS)

CVSS 3.7 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From sanitize-html 2.17.7 until 2.18.0, an application configuration that permits namespace-prefixed SVG animation elements and the relevant URL-targeting attributes can bypass the SMIL URL protection because prefixed tag names do not match the unprefixed animation-element check. The bypass can rewrite a link destination to an unsafe URI after the sanitized SVG is rendered, with script execution occurring when a user activates the affected link; the default sanitizer configuration is not unconditionally affected. This issue is fixed in sanitize-html 2.18.0.

[ Fixes ]Fixes and patches

  • sanitize-html 2.18.0Fixed version · GitHub Advisories · npm package sanitize-html: upgrade to 2.18.0 or later (affected >= 2.17.7, < 2.18.0)

[ Packages ]Affected open-source packages

[ References ]References