CVE-2026-33979 in AhmedAdelFahim express-xss-sanitizerinfo

Summary

Express XSS Sanitizer is Express 4.x and 5.x middleware which sanitizes user input data (in req.body, req.query, req.headers and req.params) to prevent Cross Site Scripting (XSS) attack. A vulnerability has been identified in versions prior to 2.0.2 where restrictive sanitization configurations are silently ignored. In version 2.0.2, the validation logic has been updated to respect explicitly provided empty configurations. Now, if allowedTags or allowedAttributes are provided (even if empty), they are passed directly to sanitize-html without being overridden.

Responsible

GitHub_M

Reservation

03/24/2026

Disclosure

03/28/2026

Entries

VulDB provides additional information and datapoints for this CVE:

ID	Vulnerability	CWE	Exp	Cou	CVE
354054	AhmedAdelFahim express-xss-sanitizer permissive list of allowed inputs	183	Not defined	Official fix	CVE-2026-33979

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