CVE-2026-116802

CVSS 6.1 (medium) · published 2026-10-27

DOMPurify before 3.4.17 contains a cross-site scripting vulnerability that allows attackers to bypass the SMIL attributeName=href guard when PARSER_MEDIA_TYPE is application/xhtml+xml, because transformCaseFunc does not lowercase attribute names. Attackers can submit SVG with an animate or set element using attributeName="href" and a javascript: entry in values to execute script when users click the sanitized link.

Weakness: CWE-79

Source: NVD CVE-2026-116802

References

• https://github.com/cure53/DOMPurify/security/advisories/GHSA-c6gr-qvv4-5v3f
• https://www.vulncheck.com/advisories/dompurify-before-3.4.17-xss-via-smil-attributename-guard-bypass-in-xhtml-mode
• https://github.com/cure53/DOMPurify/security/advisories/GHSA-c6gr-qvv4-5v3f

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