Description
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.
Problem types
CWE-183: Permissive List of Allowed Inputs
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Product status
References
github.com/...itizer/security/advisories/GHSA-3843-rr4g-m8jq
github.com/...ommit/5623009ef11dcf095c163a38dea07b9cc22ad19f
github.com/...ahim/express-xss-sanitizer/releases/tag/v2.0.2