Auth bypass in Nextcloud Nextcloud_server
CVE-2026-45810
Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 31.0.0 to before 31.0.12, and 32.0.0 to before 32.0.3, a missing check of a relation allowed authenticated users with access to any file comment…
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.000 (8.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N.
Affected products
- Nextcloud Nextcloud_server
- Nextcloud Security-advisories — versions >= 31.0.0, < 31.0.12, >= 32.0.0, < 32.0.3
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-2026-45810?
- CVE-2026-45810 is a medium-severity vulnerability in Nextcloud Nextcloud_server, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.8/10. Published 2026-06-01.
- How severe is CVE-2026-45810?
- Medium severity. CVSS v3 base score is 6.8 out of 10.