Auth bypass in Nextcloud Security-Advisories
CVE-2025-66553
Nextcloud Tables allows you to create your own tables with individual columns. Prior to 0.8.7 and 0.9.4, authenticated users were able to view meta data of columns in other tables of the Tables app by modifying the numeric ID in a request. This vulnerability is fixed in 0.8.7 and 0.9.4.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Nextcloud Security-Advisories — versions >= 0.9.0-beta.1, < 0.9.4, < 0.8.7
- Nextcloud Tables
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-p53h-6294-crjw (Patch, Vendor Advisory)
- github.com/nextcloud/tables/pull/1891 (Issue Tracking)
- github.com/nextcloud/tables/commit/e975f5bfedb6922f04cdd236cde4e26067fe064e (Patch)
- hackerone.com/reports/3138721 (Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66553?
- CVE-2025-66553 is a medium-severity vulnerability in Nextcloud Security-Advisories, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2025-12-05.
- How severe is CVE-2025-66553?
- Medium severity. CVSS v3 base score is 4.3 out of 10.