CVE-2026-45264CWE-284

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

Medium · published June 1, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
32.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00392 · 32.2th percentile
Weakness
CWE-284 · Improper Access Control
Published
2026-06-01T16:36Z
EPSS history
Timeline
  • 01 JUN 16:36Z
    Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames
    cvelistv5