Auth bypass in Nextcloud Nextcloud_server
CVE-2026-45283
Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.2, and 33.0.0 to before 33.0.1, the files_lock app did not properly validate the ownership of files when processing DAV loc…
Vulnerability class: Broken Authentication
EPSS: 0.000 (7.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Nextcloud Nextcloud_server
- Nextcloud Security-advisories — versions >= 32.0.0, < 32.0.2, >= 33.0.0, < 33.0.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Permissions Required, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-45283?
- CVE-2026-45283 is a medium-severity vulnerability in Nextcloud Nextcloud_server, classified under Improper Authentication. CVSS score: 6.3/10. Published 2026-06-01.
- How severe is CVE-2026-45283?
- Medium severity. CVSS v3 base score is 6.3 out of 10.