CVE-2026-45264
Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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 rename files in the team folder. This issue has been patched in versions 17.0.15, 18.1.12, 19.1.16, 20.1.11, and 21.0.4.
| CWE | CWE-284 |
| Vendor | nextcloud |
| Product | security-advisories |
| Published | Jun 1, 2026 |
| Last Updated | Jun 1, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
nextcloud / security-advisories
>= 17.0.0, < 17.0.15 >= 18.0.0, < 18.1.12 >= 19.0.0, < 19.1.16 >= 20.0.0, < 20.1.11 >= 21.0.0, < 21.0.4