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CVE-2026-66010

CVE-2026-66010 · DOMPurify before 3.4.12 Hook Bypass via CUSTOM_ELEMENT_HANDLING

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

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.

CVSS 5.1 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • dompurify

    Versions
    • ≥ 0, < 3.4.12: Affected (semver)
    • 3.4.12: Not affected (semver)

    Update to 3.4.12

  • node-dompurify Debian:12

    Versions
    • 2.4.1+dfsg+~2.4.0-1
    • 2.4.1+dfsg+~2.4.0-2
    • 2.4.1+dfsg+~2.4.0-2+deb12u1
    • 3.0.9+dfsg+~3.0.5-1
    • 3.1.6+dfsg+~3.0.5-1
    • 3.1.7+dfsg+~3.0.5-1
    • 3.1.7+dfsg+~3.0.5-2
    • 3.2.5+dfsg-1
    • 3.3.2+dfsg-1
    • 3.3.3+dfsg-1
    • 3.3.3+dfsg-2
    • 3.4.1+dfsg-1
    • 3.4.12+dfsg-1
    • 3.4.13+dfsg-1
    • 3.4.13+dfsg-2
    • 3.4.16+dfsg-1
    • 3.4.2+dfsg-1
    • 3.4.5+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-dompurify Debian:13

    Versions
    • 3.1.7+dfsg+~3.0.5-2
    • 3.2.5+dfsg-1
    • 3.3.2+dfsg-1
    • 3.3.3+dfsg-1
    • 3.3.3+dfsg-2
    • 3.4.1+dfsg-1
    • 3.4.12+dfsg-1
    • 3.4.13+dfsg-1
    • 3.4.13+dfsg-2
    • 3.4.16+dfsg-1
    • 3.4.2+dfsg-1
    • 3.4.5+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-dompurify Debian:14

    Versions
    • 3.1.7+dfsg+~3.0.5-2
    • 3.2.5+dfsg-1
    • 3.3.2+dfsg-1
    • 3.3.3+dfsg-1
    • 3.3.3+dfsg-2
    • 3.4.1+dfsg-1
    • 3.4.2+dfsg-1
    • 3.4.5+dfsg-1
    Affected ranges
    • ECOSYSTEM: < 3.4.12+dfsg-1

    Update to 3.4.12+dfsg-1

  • dompurify npm

    Affected ranges
    • SEMVER: < 3.4.12

    Update to 3.4.12

  • node-dompurify Ubuntu:22.04:LTS

    Versions
    • 2.3.0+dfsg-2
    • 2.3.3+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-dompurify Ubuntu:24.04:LTS

    Versions
    • 2.4.1+dfsg+~2.4.0-1
    • 3.0.9+dfsg+~3.0.5-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-dompurify Ubuntu:26.04:LTS

    Versions
    • 3.1.7+dfsg+~3.0.5-2
    • 3.3.3+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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