CVE-2026-33916

Gravedad CVSS v3.1:

MEDIA

Tipo:

CWE-79 Neutralización incorrecta de la entrada durante la generación de la página web (Cross-site Scripting)

Fecha de publicación:

27/03/2026

Última modificación:

31/03/2026

Descripción

*** Pendiente de traducción *** Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, resulting in reflected or stored XSS. Version 4.7.9 fixes the issue. Some workarounds are available. Apply `Object.freeze(Object.prototype)` early in application startup to prevent prototype pollution. Note: this may break other libraries, and/or use the Handlebars runtime-only build (`handlebars/runtime`), which does not compile templates and reduces the attack surface.

Impacto

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS v3.1 Severidad y Métricas:

Puntuación base: 4.70 MEDIA
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Vector de acceso (AV): A través de red
Complejidad de acceso (AC): Alto
Privilegios Requeridos (PR): Ninguno
Interacción del usuario (UI): Obligatorio
Alcance (S): Modificado
Impacto a la confidencialidad (C): Bajo
Impacto a la integridad (I): Bajo
Impacto a la disponibilidad (A): Ninguno