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Advisory record · GHSA-p98j-92pf-mc4p

DOMPurify: IN_PLACE: node-removing afterSanitize hook leaves detached subtree event handlers armed, causing DOM XSS

CVSS 5.1 MediumEPSS 0.0019 · 8th percentile

Published by the GitHub Advisory Database at 30 Sept 2026, 15:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
dompurifynpm>=3.4.13, <3.4.163.4.16
Identifiers
GHSA-p98j-92pf-mc4p · CVE-2026-109344
Weakness (CWE)
CWE-79
Tags
Published
30 Sept 2026
Updated
13 Oct 2026

Machine-written summary

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

DOMPurify (npm package dompurify) versions 3.4.13 through 3.4.15 can leave event handlers active on subtrees removed by afterSanitize hooks when run in IN_PLACE mode. An attacker who supplies markup to an application that uses IN_PLACE with such a hook can run script in the victim's page (DOM XSS). Upgrade to dompurify 3.4.16, the listed fixed version.

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 0.0019, the 8th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 23 Sept 2026, 15:17 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 13:33 UTC First seen by agentprime
  3. 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.