CVE-2026-45690

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In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authentication bypass vulnerability allowed attackers with knowledge of a user's password to circumvent two-factor authentication (2FA) protections. When a user initiated login with valid credentials on a 2FA-enabled account, the system created a temporary session token before enforcing the second factor challenge. This token could be extracted and replayed via HTTP Basic Authentication to gain unauthorized access to authenticated endpoints. It is recommended that the Nextcloud Server is upgraded to 33.0.3 or 32.0.9. It is recommended that the Nextcloud Enterprise Server is upgraded to 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9 or 29.0.16.16"}, {"lang": "es", "value": "Nextcloud es una plataforma de colaboraci\u00f3n de contenido de c\u00f3digo abierto. En el Servidor Nextcloud desde las versiones 32.0.0 hasta antes de la 32.0.9, y 33.0.0 hasta antes de la 33.0.3, una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n permiti\u00f3 a atacantes con conocimiento de la contrase\u00f1a de un usuario eludir las protecciones de autenticaci\u00f3n de dos factores (2FA). Cuando un usuario iniciaba sesi\u00f3n con credenciales v\u00e1lidas en una cuenta con 2FA habilitado, el sistema creaba un token de sesi\u00f3n temporal antes de aplicar el desaf\u00edo del segundo factor. Este token pod\u00eda ser extra\u00eddo y reproducido a trav\u00e9s de Autenticaci\u00f3n B\u00e1sica HTTP para obtener acceso no autorizado a puntos finales autenticados. Se recomienda que el Servidor Nextcloud se actualice a la 33.0.3 o 32.0.9. 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