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CVE-2026-113657

CVE-2026-113657 · ApostropheCMS sanitize-html: SMIL animation namespace-prefix bypass allows javascript: URI injection (XSS)

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 3.7 · Low · EPSS 0.3% · Public exploit · Fix available

Published
Updated

Stack: node

Affected products and versions

  • apostrophe

    Versions
    • < 4.33.0: Affected

    No fix published

  • sanitize-html

    Versions
    • >= 2.17.7, < 2.18.0: Affected

    No fix published

  • sanitize-html npm

    Affected ranges
    • SEMVER: ≥ 2.17.7, < 2.18.0

    Update to 2.18.0

Original sources

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