Medium 4.3Published Dec 5, 2025

CVE-2025-66552Nextcloud Server is a self hosted personal cloud system.

Updated under an hour ago (2026-10-19 11:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for nextcloud_server

Exploited in the last 30 days

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: 4.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-778
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Oct 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nextcloud nextcloud_server nextcloud:nextcloud_server	from 30.0.0 before 30.0.9; from 30.0.0 before 30.0.9; from 31.0.0 before 31.0.1; from 31.0.0 before 31.0.1	NVD

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-ww9m-f8j4-jj9xpatch, vendor-advisory
https://github.com/nextcloud/server/commit/7cc005c43c72bc384848cf8cb851895827c412f6patch
https://github.com/nextcloud/server/pull/50992issue-tracking
https://hackerone.com/reports/2890071issue-tracking, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.