CVE-2026-45154 Nextcloud: Improper Access Control in Collectives

Nextcloud is an open source content collaboration platform. From version 2.6.0 to before version 4.3.0, when a previous collective pages was deleted and the collective was shared view-only, guests with access to the collective were able to access the deleted pages directly from the trashbin. This...

CVE-2026-45154 Nextcloud: Improper Access Control in Collectives

Nextcloud is an open source content collaboration platform. From version 2.6.0 to before version 4.3.0, when a previous collective pages was deleted and the collective was shared view-only, guests with access to the collective were able to access the deleted pages directly from the trashbin. This...

CVE-2026-45153 Nextcloud: PIN bypass in PassCodeActivity via back button

Nextcloud is an open source content collaboration platform. From version 33.0.0 to before version 33.1.0, after unlocking a locked Android phone the back-button could be used to bypass the Nextcloud Files app PIN. This issue has been patched in version 33.1.0...

CVE-2026-45153 Nextcloud: PIN bypass in PassCodeActivity via back button

Nextcloud is an open source content collaboration platform. From version 33.0.0 to before version 33.1.0, after unlocking a locked Android phone the back-button could be used to bypass the Nextcloud Files app PIN. This issue has been patched in version 33.1.0...

CVE-2026-45153

CVE-2026-45153 describes a PIN bypass in Nextcloud on Android. After unlocking a locked device, the back button could be used to bypass the Nextcloud Files app PIN for versions 33.0.0 up to (but not including) 33.1.0. The issue is mitigated by the patch in 33.1.0. The available sources confirm th...

EUVD-2026-33672

Nextcloud is an open source content collaboration platform. From version 33.0.0 to before version 33.1.0, after unlocking a locked Android phone the back-button could be used to bypass the Nextcloud Files app PIN. This issue has been patched in version 33.1.0...

CVE-2026-45153 Nextcloud: PIN bypass in PassCodeActivity via back button

Nextcloud is an open source content collaboration platform. From version 33.0.0 to before version 33.1.0, after unlocking a locked Android phone the back-button could be used to bypass the Nextcloud Files app PIN. This issue has been patched in version 33.1.0...

CVE-2026-45264

Nextcloud shows an ACL-based permission bypass affecting Team Folders. A user with READ and CREATE (but not UPDATE) permission could rename files within a Team Folder in multiple branches: 17.0.0–17.0.14, 18.0.0–18.1.11, 19.0.0–19.1.15, 20.0.0–20.1.10, and 21.0.0–21.0.3. The issue has been patche...

EUVD-2026-33671

Nextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before 20.1.11, and 21.0.0 to before 21.0.4, a user with READ and CREATE permission, but no UPDATE permission for a team folder can...

CVE-2026-45264 Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames

Nextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before 20.1.11, and 21.0.0 to before 21.0.4, a user with READ and CREATE permission, but no UPDATE permission for a team folder can...

CVE-2026-45264 Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames

Nextcloud is an open source content collaboration platform. From versions 17.0.0 to before 17.0.15, 18.0.0 to before 18.1.12, 19.0.0 to before 19.1.16, 20.0.0 to before 20.1.11, and 21.0.0 to before 21.0.4, a user with READ and CREATE permission, but no UPDATE permission for a team folder can...

CVE-2026-45155: Authorization Bypass Through User-Controlled Key

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.7 and 33.0.0 to before 33.0.1, a missing access check on API level allowed to add unknown circles by their ID directly to other circles. Since circle IDs have 62^15 complexity by...

PT-2026-45530

Name of the Vulnerable Software and Affected Versions Nextcloud versions 5.5.13 through 5.5.16 Nextcloud versions 6.2.0 through 6.2.2 Description An authenticated user can enumerate other users on the same instance. This is possible because sharing restrictions were not effectively applied to the...

CVE-2026-45154: Improper Access Control

Nextcloud is an open source content collaboration platform. From version 2.6.0 to before version 4.3.0, when a previous collective pages was deleted and the collective was shared view-only, guests with access to the collective were able to access the deleted pages directly from the trashbin. This...

Nextcloud user_oidc 授权问题漏洞

Nextcloud useroidc is an application developed by the German company Nextcloud. There were authorization issues in versions of Nextcloud useroidc between 0.3.0 and 3.1.0, as well as between 5.0.0 and 5.1.0, and between 6.0.0 and 6.4.0. This issue stemmed from a lack of User OIDC signature...

CVE-2026-45282: Improper Access Control

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 authenticated attacker can access attachments of link shares when knowing the share token, circumventing password protection or download...

CVE-2026-45283: Improper Authentication

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.2, and 33.0.0 to before 33.0.1, the fileslock app did not properly validate the ownership of files when processing DAV lock and unlock requests. An authenticated user could lock or...

CVE-2026-45543: Files or Directories Accessible to External Parties

Nextcloud is an open source content collaboration platform. From version 4.3.0 to before version 5.2.7, a removed collaborator retains unauthorized read access to uploaded respondent files for the affected form. The scope is limited to uploaded files for forms where that user previously had resul...

CVE-2026-45284: Improper Access Control

Nextcloud is an open source content collaboration platform. From version 1.3.6 to before version 8.4.0, an improper check allowed users that where provided by LDAP to still authenticate towards user OIDC after they where deleted. This issue has been patched in version 8.4.0...

CVE-2026-45281: Authorization Bypass Through User-Controlled Key

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, with the knowledge of other users’ principal URL an attacker could possibly send a request to gain full access to their calendar. Therefore, the...