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.
Metrics
Affected Vendors & Products
References
History
Tue, 31 Mar 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Express Xss Sanitizer Project
Express Xss Sanitizer Project express Xss Sanitizer |
|
| CPEs | cpe:2.3:a:express_xss_sanitizer_project:express_xss_sanitizer:*:*:*:*:*:node.js:*:* | |
| Vendors & Products |
Express Xss Sanitizer Project
Express Xss Sanitizer Project express Xss Sanitizer |
Tue, 31 Mar 2026 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Mon, 30 Mar 2026 07:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Ahmedadelfahim
Ahmedadelfahim express-xss-sanitizer |
|
| Vendors & Products |
Ahmedadelfahim
Ahmedadelfahim express-xss-sanitizer |
Sat, 28 Mar 2026 03:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Express XSS Sanitizer: allowedTags/allowedAttributes bypass leads to permissive sanitization (XSS risk) | |
| Weaknesses | CWE-183 CWE-79 |
|
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-03-27T21:29:19.759Z
Updated: 2026-03-31T14:29:43.694Z
Reserved: 2026-03-24T22:20:06.210Z
Link: CVE-2026-33979
Updated: 2026-03-31T14:29:39.564Z
Status : Analyzed
Published: 2026-03-27T22:16:22.433
Modified: 2026-03-31T18:24:58.820
Link: CVE-2026-33979
No data.
ReportizFlow