CVE-2026-45264

Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames

Published Jun 1, 2026 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Nextcloud
Nextcloud groupfolders
Vendors & Products Nextcloud
Nextcloud groupfolders
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames
Weaknesses CWE-284
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 1, 2026, 5:47 PM
Reserved
May 11, 2026, 6:41 PM
Status
Deferred
Published
Jun 1, 2026, 5:17 PM
Modified
Jul 22, 2026, 7:10 AM