CVE-2026-65901: DOMPurify 3.4.6 Cross-Site Scripting via IN_PLACE nodeName

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-07-23 · updated 2026-10-24
Weakness: CWE-79

Description

DOMPurify through 3.4.6 contains a cross-site scripting vulnerability in IN_PLACE mode that trusts attacker-controlled nodeName on live non-form nodes. Attackers can supply hostile live DOM objects with real script children whose observable nodeName is clobbered to appear as allowed elements, causing scripts to execute when the sanitized tree is inserted into a live document.

Affected products

cure53 DOMPurify: before 3.4.7 — fixed in 3.4.7

How to fix

Upgrade to a fixed version: cure53 DOMPurify 3.4.7. Check the vendor advisory for mitigations.

References

https://github.com/cure53/DOMPurify/security/advisories/GHSA-x4vx-rjvf-j5p4
https://www.vulncheck.com/advisories/dompurify-cross-site-scripting-via-in-place-nodename
https://github.com/cure53/DOMPurify/security/advisories/GHSA-x4vx-rjvf-j5p4

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