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Advisories

DOMPurify before 3.4.0 ADD_TAGS Function Bypasses FORBID_TAGS

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severity
medium
date
Affecting

  • DOMPurify >= 0, < 3.4.0

CWE
  • CWE-697 Incorrect Comparison
CVSS
5.1
CVSS V4 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
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.

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