CVE-2026-40864

Gravedad CVSS v3.1:

MEDIA

Tipo:

CWE-352 Falsificación de petición en sitios cruzados (Cross-Site Request Forgery)

Fecha de publicación:

22/05/2026

Última modificación:

01/06/2026

Descripción

*** Pendiente de traducción *** JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. In versions 4.1.0 through 5.4.4, XSRF protection (updated in 4.1.0) inappropriately treated requests with Sec-Fetch-Mode: no-cors as same-origin requests, bypassing XSRF checks. The JSON API is not affected, only HTTP form endpoints, such as /hub/spawn and /hub/accept-share, meaning attackers could trigger server spawn (but not access the server) and if the attacker is a JupyterHub user permitted to share access to their server, cause a user to accept a share and have access to the attacker&#39;s server. This issue has been fixed in version 5.4.5. If developers are unable to immediately upgrade, they can temporarily mitigate this issue by dropping requests to JupyterHub with Sec-Fetch-Mode: no-cors if they are using a reverse proxy.

Impacto

Vector 3.x

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

Puntuación base: 5.40 MEDIA
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

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