CVE-2026-65903

Description

DOMPurify before 3.4.0 contains a logic error in the ADD_TAGS function where short-circuit evaluation allows forbidden tags to bypass FORBID_TAGS restrictions. Attackers can craft input containing tags listed in FORBID_TAGS that are also added via ADD_TAGS function, causing them to be retained in sanitized output.

CVSS Vector

References

• https://github.com/cure53/DOMPurify/security/advisories/GHSA-39q2-94rc-95cp
• https://www.vulncheck.com/advisories/dompurify-before-add-tags-function-bypasses-forbid-tags