Cross-Site Scripting Vulnerability in DOMPurify by Cure53
CVE-2026-116803

5.1MEDIUM

Key Information:

Vendor

Cure53

Status
Dompurify
Vendor
CVE Published:
26 October 2026

What is CVE-2026-116803?

DOMPurify, prior to version 3.4.17, is exposed to a cross-site scripting vulnerability where event handlers can be improperly retained when an IN_PLACE hook removes related DOM nodes. This flaw allows attacker-controlled markup within isolated subtrees to possibly execute after the sanitize() function has completed, leading to the execution of DOM XSS attacks. Developers and web administrators are advised to upgrade to the latest version for enhanced security.

Affected Version(s)

DOMPurify 0 < 3.4.17

DOMPurify 3.4.17

References

https://github.com/cure53/DOMPurify/security/advisories/G...
vendor-advisory
https://www.vulncheck.com/advisories/dompurify-before-3.4...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

uttej-badwane
.