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

Weakness classification (CWE)

References

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.