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Advisory record · GHSA-c6gr-qvv4-5v3f

DOMPurify: SMIL attributeName=href guard is skipped when PARSER_MEDIA_TYPE is application/xhtml+xml

CVSS 5.1 MediumEPSS 0.0022 · 12th percentile

Published by the GitHub Advisory Database at 22 Oct 2026, 16:24 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
dompurifynpm<3.4.173.4.17
Identifiers
GHSA-c6gr-qvv4-5v3f · CVE-2026-116802
Weakness (CWE)
CWE-79
Tags
Published
22 Oct 2026
Updated
27 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

DOMPurify versions before 3.4.17 (fixed in 3.4.17) fail to strip SMIL attributeName values containing "href" when the application uses PARSER_MEDIA_TYPE set to application/xhtml+xml and allows animate or set with attributeName. An attacker who can supply markup to such a sanitizer could keep a payload that, once a user clicks the parent link, runs script in the application's origin, so this is a stored or reflected XSS needing a user click. The issue does not occur with default configurations or in text/html mode. Upgrade to DOMPurify 3.4.17 or later.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.1 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0022, the 12th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 12 Oct 2026, 12:40 UTC Published by the maintainers as a GitHub repository advisory
  2. 26 Oct 2026, 23:05 UTC Confirmed by the CVE List
  3. 27 Oct 2026, 00:17 UTC Confirmed by NVD
  4. 31 Oct 2026, 13:33 UTC First seen by agentprime
  5. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.