CVE-2026-33979

HIGH

8.2

Descripcion

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.

Detalles CVE

Puntuacion CVSS v3.18.2

SeveridadHIGH

Vector CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Vector de ataqueNETWORK

ComplejidadLOW

Privilegios requeridosNONE

Interaccion usuarioNONE

Publicado3/27/2026

Ultima modificacion3/31/2026

Fuentenvd

Avistamientos honeypot0

Productos afectados

express_xss_sanitizer_project:express_xss_sanitizer

Debilidades (CWE)

CWE-79CWE-183

Referencias

https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/5623009ef11dcf095c163a38dea07b9cc22ad19f(security-advisories@github.com)

https://github.com/AhmedAdelFahim/express-xss-sanitizer/releases/tag/v2.0.2(security-advisories@github.com)

https://github.com/AhmedAdelFahim/express-xss-sanitizer/security/advisories/GHSA-3843-rr4g-m8jq(security-advisories@github.com)

Correlaciones IOC

Sin correlaciones registradas

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