Vulnerability · Published Jul 23, 2026 · Assigned by VulnCheck

CVE-2026-65912DOMPurify before 3.3.2 URI Validation Bypass via ADD_ATTR

Medium 6.1

In plain English

A medium-severity cross-site scripting in DOMPurify from cure53. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 77.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	node-dompurify	no fix listed	DEBIAN-CVE-2026-65912
Debian:13	node-dompurify	no fix listed	DEBIAN-CVE-2026-65912
Debian:14	node-dompurify	3.3.2+dfsg-1	DEBIAN-CVE-2026-65912
Ubuntu:22.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-65912
Ubuntu:24.04:LTS	node-dompurify	no fix listed	UBUNTU-CVE-2026-65912
npm	dompurify	3.3.2	GHSA-cjmm-f4jc-qw8r

Affected products (as reported)

Vendor	Product	Versions
cure53	DOMPurify	0 – before 3.3.2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-cjmm-f4jc-qw8r) vendor-advisory
VulnCheck Advisory: DOMPurify before 3.3.2 URI Validation Bypass via ADD_ATTR third-party-advisory