What is CVE-2026-109344?

CVE-2026-109344 is a medium-severity vulnerability in Cure53 Dompurify, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-12.

How severe is CVE-2026-109344?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Cure53 Dompurify

CVE-2026-109344

DOMPurify from 3.4.13 before 3.4.16 contains a cross-site scripting vulnerability because IN_PLACE mode fails to neutralize subtrees detached by afterSanitizeElements or afterSanitizeAttributes hooks. Attackers can supply markup with on* handlers inside a wrapper removed by such hooks, leaving handlers armed on the live DOM to execute script in the victim origin.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Cure53 Dompurify

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/cure53/DOMPurify/security/advisories/GHSA-p98j-92pf-mc4p (vendor-advisory)
www.vulncheck.com/advisories/dompurify-from-3.4.13-before-3.4.16-dom-xss-via-in… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109344?: CVE-2026-109344 is a medium-severity vulnerability in Cure53 Dompurify, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-12.
How severe is CVE-2026-109344?: Medium severity. CVSS v3 base score is 6.1 out of 10.