Medium 4.3Published Jun 1, 2026

CVE-2026-45264Nextcloud: ACL Rename Permission Bypass in Team Folders Allows Unauthorized File Renames

Updated under an hour ago (Oct 26, 2026, 7:10 AM ET)

Does this affect you?

It affects nextcloud security-advisories. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for nextcloud security-advisories

Exploited in the last 30 days

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.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jun 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nextcloud security-advisories nextcloud:security_advisories (from the name)	from 17.0.0, < 17.0.15; from 18.0.0, < 18.1.12; from 19.0.0, < 19.1.16; from 20.0.0, < 20.1.11; from 21.0.0, < 21.0.4	CNA record

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wx2x-822r-rvmfx-refsource-confirm
https://github.com/nextcloud/groupfolders/pull/4361x-refsource-misc
https://hackerone.com/reports/3540673x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.