CVE-2026-65903: CURE53 Dompurify

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• CURE53 Dompurify: before 3.4.0 (fixed in 3.4.0)

Published 2026-07-23. Last modified 2026-07-28.