URI Validation Bypass in DOMPurify Affects Security
CVE-2026-65912

5.1MEDIUM

Key Information:

Vendor

Cure53

Status
Dompurify
Vendor
CVE Published:
23 July 2026

What is CVE-2026-65912?

DOMPurify versions prior to 3.3.2 are susceptible to a URI validation bypass vulnerability due to the ADD_ATTR predicate function in EXTRA_ELEMENT_HANDLING.attributeCheck. This weakness allows attackers to manipulate the sanitization process by providing a predicate that accepts specific tag and attribute combinations. Consequently, unsafe protocols, such as 'javascript:', can evade sanitization processes, leading to potential DOM-based cross-site scripting (XSS) attacks when links are activated.

Affected Version(s)

DOMPurify 0 < 3.3.2

DOMPurify 3.3.2

References

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

christos-eth
.