What’s Vulnerable › Vulnerabilities

CVE-2026-109344: DOMPurify from 3.4.13 before 3.4.16 DOM XSS via IN_PLACE afterSanitize Hooks

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-12 · updated 2026-10-16
• Weakness: CWE-79

Description

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.

Affected products

• cure53 DOMPurify: from 3.4.13 before 3.4.16 — fixed in 3.4.16

How to fix

Upgrade to a fixed version: cure53 DOMPurify 3.4.16. Check the vendor advisory for mitigations.

References

• https://github.com/cure53/DOMPurify/security/advisories/GHSA-p98j-92pf-mc4p
• https://www.vulncheck.com/advisories/dompurify-from-3.4.13-before-3.4.16-dom-xss-via-in-place-aftersanitize-hooks

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