CVE-2026-65912

MEDIUM 6.1

DOMPurify before 3.3.2 URI Validation Bypass via ADD_ATTR

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

DOMPurify before 3.3.2 contains a URI validation bypass vulnerability when ADD_ATTR is provided as a predicate function via EXTRA_ELEMENT_HANDLING.attributeCheck. Attackers can supply a predicate that accepts specific attribute and tag combinations to bypass URI-safe validation, allowing unsafe protocols like javascript: to survive sanitization and execute as DOM-based XSS when the link is activated.

CWE	CWE-79
Vendor	cure53
Product	dompurify
Published	Jul 23, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

cure53 / DOMPurify

0 < 3.3.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/cure53/DOMPurify/security/advisories/GHSA-cjmm-f4jc-qw8r vulncheck.com: https://www.vulncheck.com/advisories/dompurify-before-uri-validation-bypass-via-add-attr

Credits

🔍 christos-eth