CVE-2026-33979

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...

CVE-2026-33979

CVE-2026-33979 affects the Express XSS Sanitizer middleware (Express 4.x/5.x). The root cause is that, in versions prior to 2.0.2, explicitly provided empty configurations for allowedTags or allowedAttributes are ignored, causing a fallback to sanitize-html’s permissive defaults. This leads to a ...

CVE-2026-33979

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...