Auth bypass in Nextcloud Nextcloud_server
CVE-2026-45281
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, with the knowledge of other users’ principal URL an attacker could possibly send a request…
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.000 (8.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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, Mitigation, 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-2026-45281?
- CVE-2026-45281 is a high-severity vulnerability in Nextcloud Nextcloud_server, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-06-01.
- How severe is CVE-2026-45281?
- High severity. CVSS v3 base score is 8.1 out of 10.