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.
References
| Link | Resource |
|---|---|
| https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/5623009ef11dcf095c163a38dea07b9cc22ad19f | Patch |
| https://github.com/AhmedAdelFahim/express-xss-sanitizer/releases/tag/v2.0.2 | Product Release Notes |
| https://github.com/AhmedAdelFahim/express-xss-sanitizer/security/advisories/GHSA-3843-rr4g-m8jq | Exploit Mitigation Vendor Advisory |
Configurations
Configuration 1 (hide)
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History
31 Mar 2026, 18:24
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:express_xss_sanitizer_project:express_xss_sanitizer:*:*:*:*:*:node.js:*:* | |
| References | () https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/5623009ef11dcf095c163a38dea07b9cc22ad19f - Patch | |
| References | () https://github.com/AhmedAdelFahim/express-xss-sanitizer/releases/tag/v2.0.2 - Product, Release Notes | |
| References | () https://github.com/AhmedAdelFahim/express-xss-sanitizer/security/advisories/GHSA-3843-rr4g-m8jq - Exploit, Mitigation, Vendor Advisory | |
| First Time |
Express Xss Sanitizer Project
Express Xss Sanitizer Project express Xss Sanitizer |
27 Mar 2026, 22:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-03-27 22:16
Updated : 2026-03-31 18:24
NVD link : CVE-2026-33979
Mitre link : CVE-2026-33979
CVE.ORG link : CVE-2026-33979
JSON object : View
Products Affected
express_xss_sanitizer_project
- express_xss_sanitizer