Auth bypass in Nextcloud Security-advisories
CVE-2025-66551
Nextcloud Tables allows you to create your own tables with individual columns. Prior to 0.8.6 and 0.9.3, a malicious user was able to create their own table and then move a column to a victims table. This vulnerability is fixed in 0.8.6 an…
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.002 (11.9th 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:R/S:U/C:N/I:H/A:L.
Affected products
- Nextcloud Security-advisories — versions >= 0.9.0-beta.1, < 0.9.3, < 0.8.6
- Nextcloud Tables
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 (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66551?
- CVE-2025-66551 is a medium-severity vulnerability in Nextcloud Security-advisories, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.3/10. Published 2025-12-05.
- How severe is CVE-2025-66551?
- Medium severity. CVSS v3 base score is 6.3 out of 10.