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...

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...