Medium 6.1Published Oct 26, 2026

CVE-2026-116802DOMPurify before 3.4.17 XSS via SMIL attributeName Guard Bypass in XHTML Mode

Updated under an hour ago (Oct 29, 2026, 11:23 PM ET)

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It affects cure53 DOMPurify. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 26, 2026

Affected products

Affected products

cure53 DOMPurify cure53:dompurify (from the name)	before 3.4.17; 3.4.17 not affected	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.