CVE-2026-65903

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.

Scoring

Severity

MEDIUM

CVSS base score

6.1

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

EPSS probability

0.33%

CWE

CWE-697

Published

2026-07-23

Last modified

2026-07-24

Affected products

• cure53 DOMPurify
• cure53 DOMPurify

Weakness type

• CWE-697

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