CVE-2026-33979 Express XSS Sanitizer: allowedTags/allowedAttributes bypass leads to permissive sanitization (XSS risk)

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...

EUVD-2026-16876

Express XSS Sanitizer: allowedTags/allowedAttributes bypass leads to permissive sanitization XSS risk...

Express XSS Sanitizer: allowedTags/allowedAttributes bypass leads to permissive sanitization (XSS risk)

Description A vulnerability has been identified in express-xss-sanitizer , , , etc. and attributes e.g., href on . This behavior violates the expected API contract and may lead to security issues such as content injection or XSS, depending on how the sanitized output is used. Impact Developers...