Vulnerability record · CVE-2025-66552 · published 5 December 2025

CVE-2025-66552: Nextcloud server vulnerability

Nextcloud · Nextcloud Server

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.

4.3 CVSS 3.1 Medium EPSS 0.31% · top 78.5% CWE-778 · CWE-778

4.3CVSS 3.1 base score

0.31%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

4References

17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Nextcloud Server Nextcloud

References

Link	Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-ww9m-f8j4-jj9x	PatchVendor Advisory
https://github.com/nextcloud/server/commit/7cc005c43c72bc384848cf8cb851895827c412f6	Patch
https://github.com/nextcloud/server/pull/50992	Issue Tracking
https://hackerone.com/reports/2890071	Issue TrackingVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-66552), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.