Medium severity6.1NVD Advisory· Published Oct 27, 2026

CVE-2026-116802

Description

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cure53/Dompurifyllm-fuzzy
Range: <3.4.17

Patches

Vulnerability mechanics

References

github.com/cure53/DOMPurify/security/advisories/GHSA-c6gr-qvv4-5v3fnvd
www.vulncheck.com/advisories/dompurify-before-3.4.17-xss-via-smil-attributename-guard-bypass-in-xhtml-modenvd

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cvss	0.397
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000