DOMPurify SAFE_FOR_TEMPLATES Bypass Vulnerability in Cure53 Product
CVE-2026-116804

5.1MEDIUM

Key Information:

Vendor

Cure53

Status
Dompurify
Vendor
CVE Published:
26 October 2026

What is CVE-2026-116804?

A vulnerability has been identified in DOMPurify versions 3.4.4 up to 3.4.16, which allows a SAFE_FOR_TEMPLATES bypass. Attackers can exploit this weakness by preserving template expressions in attached shadow roots when operating in RETURN_DOM, RETURN_DOM_FRAGMENT, or IN_PLACE modes. They can strategically split expressions across text nodes that are separated by disallowed elements, leading to a risk where these expressions can merge after their removal, ultimately being evaluated by downstream template engines. This creates opportunities for cross-site scripting (XSS) attacks, endangering web applications that rely on DOMPurify for sanitization.

Affected Version(s)

DOMPurify 3.4.4 < 3.4.17

DOMPurify 3.4.17

References

https://github.com/cure53/DOMPurify/security/advisories/G...
vendor-advisory
https://www.vulncheck.com/advisories/dompurify-from-3.4.4...
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

manus-pi
manus-use
.