CVE-2026-45278Nextcloud: Open Redirect in user_oidc login flow via protocol-relative URL bypass

Descripción

Nextcloud is an open source content collaboration platform. From version 6.1.0 to before version 8.2.2, an attacker can craft links that would redirect users to another website, when the victim uses the attackers link to log in via user OIDC. This issue has been patched in version 8.2.2.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8wjr-5cg8-4w73 Vendor Advisory
• https://github.com/nextcloud/user_oidc/pull/1273 Issue TrackingPatch
• https://hackerone.com/reports/3464925 Permissions Required