PT-2026-63989 · Dompurify · Dompurify

CVE-2026-65903 · Published 2026-04-16 · Updated 2026-07-23

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions DOMPurify versions prior to 3.4.0

Description A logic error exists in the ADD TAGS function where short-circuit evaluation allows tags listed in FORBID TAGS to bypass restrictions. This occurs when tags are simultaneously listed in both FORBID TAGS and added via the ADD TAGS function, resulting in the forbidden tags being retained in the sanitized output.

Recommendations Update to version 3.4.0 or later.

Exploit

Fix

Weakness Enumeration

CWE-783

CWE-697

Related Identifiers

CVE-2026-65903

GHSA-39Q2-94RC-95CP

Affected Products

Dompurify

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65903.json · Exploit
• https://github.com/cure53/DOMPurify/security/advisories/GHSA-39q2-94rc-95cp · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-65903 · Security Note
• https://osv.dev/vulnerability/GHSA-39q2-94rc-95cp · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-65903 · Vendor Advisory
• https://github.com/cure53/DOMPurify · Note
• https://vulncheck.com/advisories/dompurify-before-add-tags-function-bypasses-forbid-tags · Note