Auth bypass in Nextcloud Nextcloud_server
CVE-2026-45690
Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authentication bypass vulnerability allowed attackers with knowledge of a user's passwor…
Vulnerability class: Broken Authentication
EPSS: 0.001 (19.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N.
Affected products
- Nextcloud Nextcloud_server
- Nextcloud Security-advisories — versions >= 32.0.0, < 32.0.9, >= 33.0.0, < 33.0.3
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-2026-45690?
- CVE-2026-45690 is a medium-severity vulnerability in Nextcloud Nextcloud_server, classified under Improper Authentication. CVSS score: 5.9/10. Published 2026-06-01.
- How severe is CVE-2026-45690?
- Medium severity. CVSS v3 base score is 5.9 out of 10.