CVE-2026-45286 Nextcloud: Calendar app leaked user identifiers via attendee suggestion endpoint

Nextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user can enumerate users on the same Nextcloud instance by using the Calendar app's endpoint for suggesting attendees. The sharing restrictions, applied t...

CVE-2026-45279 Nextcloud: Limited path traversal via template API if using `{lang}` in config

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 31.0.0 to before 31.0.14, and 32.0.0 to before 32.0.4, if lang is used in the template directory config value, non-admin users can in some cases copy arbitrary files depending on unix permissions into...

CVE-2026-45157

CVE-2026-45157 affects Nextcloud Server: versions 32.0.0 up to but not including 32.0.9, and 33.0.0 up to but not including 33.0.3. A user with access to another user’s file share can use the share token to access the share’s chunking upload process and view temporary part files during ongoing up...

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-2023-25160

Nextcloud Mail is an email app for the Nextcloud home server platform. Prior to versions 2.2.1, 1.14.5, 1.12.9, and 1.11.8, an attacker can access the mail box by ID getting the subjects and the first characters of the emails. Users should upgrade to Mail 2.2.1 for Nextcloud 25, Mail 1.14.5 for...

CVE-2025-66552 Nextcloud Server admin_audit does not log all actions on files in groupfolders

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 30.0.9 and 31.0.1, incorrect path handling with groupfolders caused the adminaudit app to not properly log all actions on files and folders inside groupfolders. This vulnerability is fixed ...

PT-2024-9154 · Nextcloud +1 · Nextcloud Enterprise Server +2

Name of the Vulnerable Software and Affected Versions: Nextcloud Server versions prior to 28.0.10 Nextcloud Server versions prior to 29.0.7 Nextcloud Enterprise Server versions prior to 27.1.11.8 Nextcloud Enterprise Server versions prior to 28.0.10 Nextcloud Enterprise Server versions prior to...

Nextcloud Security Breach

Nextcloud is an open source suite of self-hosted file synchronization and sharing communication application platform from Nextcloud, Germany. A security vulnerability exists in Nextcloud guests that stems from the ability for all users to reset the application list for guest users. Affected...

Nextcloud Security Breach

Nextcloud is an open source suite of self-hosted file synchronization and sharing communication application platform from Nextcloud Germany. A security vulnerability exists in Nextcloud Server that originates from allowing an attacker to inject HTML code in the search UI. Affected products and...

PT-2023-8433 · Nextcloud +1 · Nextcloud Enterprise Server +2

Name of the Vulnerable Software and Affected Versions: Nextcloud Server versions 25.0.0 through 25.0.10 Nextcloud Server versions 26.0.0 through 26.0.5 Nextcloud Server versions 27.0.0 through 27.0.0 prior to 27.1.0 Nextcloud Enterprise Server versions 25.0.0 through 25.0.10 Nextcloud Enterprise...

PT-2023-2378 · Nextcloud +2 · Nextcloud +2

Name of the Vulnerable Software and Affected Versions: Nextcloud versions 25.0.0 through 25.0.2 Description: The issue is related to Uncontrolled Resource Consumption in Nextcloud, an Open Source private cloud software. A user can configure a very long password, which consumes more resources on...