CVE-2025-66552

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 30.0.9 and 31.0.1, incorrect path handling with groupfolders caused the admin_audit app to not properly log all actions on files and folders inside groupfolders. This vulnerability is fixed in Nextcloud Server and Enterprise Server prior to 30.0.9 and 31.0.1.

CVSS 3.1

4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 23% of CVEs (scores of 2026-10-25)

CWE

CWE-778

Published

2025-12-05

Modified

2026-10-18

Record from

the NVD, synced 2026-10-19

Affected

• nextcloud:nextcloud_server

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-ww9m-f8j4-jj9x
• https://github.com/nextcloud/server/commit/7cc005c43c72bc384848cf8cb851895827c412f6
• https://github.com/nextcloud/server/pull/50992
• https://hackerone.com/reports/2890071

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