Title: Nextcloud, Description: Nextcloud es una plataforma de colaboración de contenido de código 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 omisión de autenticación permitió a atacantes con conocimiento de la contraseña de un usuario eludir las protecciones de autenticación de dos factores (2FA). Cuando un usuario iniciaba sesión con credenciales válidas en una cuenta con 2FA habilitado, el sistema creaba un token de sesión temporal antes de aplicar el desafío del segundo factor. Este token podía ser extraído y reproducido a través de Autenticación Básica 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. Se recomienda que el Servidor Nextcloud Enterprise se actualice a la 33.0.3, 32.0.9, 31.0.14.5, 30.0.17.9 o 29.0.16.16

{"timestamp":"2026-06-02T12:48:56.930426Z","id":"CVE-2026-45690","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"nextcloud","product":"security-advisories","versions":[{"version":">= 32.0.0, < 32.0.9","status":"affected"},{"version":">= 33.0.0, < 33.0.3","status":"affected"}]}]

OR
          *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* versions from (including) 32.0.0 up to (excluding) 32.0.9
          *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* versions from (including) 33.0.0 up to (excluding) 33.0.3

OR
          *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* versions from (including) 29.0.0 up to (excluding) 29.0.16.16
          *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* versions from (including) 30.0.0 up to (excluding) 30.0.17.9
          *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* versions from (including) 31.0.0 up to (excluding) 31.0.14.5
          *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* versions from (including) 32.0.0 up to (excluding) 32.0.9
          *cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* versions from (including) 33.0.0 up to (excluding) 33.0.3

GitHub, Inc.: https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jgcj-v42r-9922 Types: Vendor Advisory

GitHub, Inc.: https://github.com/nextcloud/server/pull/59758 Types: Issue Tracking, Patch

GitHub, Inc.: https://hackerone.com/reports/3639301 Types: Permissions Required

Nextcloud is an open source content collaboration platform. 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

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

CWE-287

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jgcj-v42r-9922

https://github.com/nextcloud/server/pull/59758

https://hackerone.com/reports/3639301