CVE-2026-75838: DOMPurify before 3.4.13 Cross-Site Scripting via IN_PLACE hook

Severity: medium (CVSS 5.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-18 · updated 2026-10-22
Weakness: CWE-79

Description

DOMPurify before 3.4.13 contains a cross-site scripting vulnerability in IN_PLACE sanitization where element-removal hooks fail to neutralize detached subtrees. Attackers can supply HTML with event handlers on descendant elements that execute after sanitization completes, even though the returned root appears clean.

Affected products

cure53 DOMPurify: before 3.4.13 — fixed in 3.4.13

How to fix

Upgrade to a fixed version: cure53 DOMPurify 3.4.13. Check the vendor advisory for mitigations.

References

https://github.com/cure53/DOMPurify/security/advisories/GHSA-55q2-fjhq-7xh7
https://www.vulncheck.com/advisories/dompurify-before-cross-site-scripting-via-in-place-hook
https://github.com/cure53/DOMPurify/security/advisories/GHSA-55q2-fjhq-7xh7

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