CVE-2025-66552

Name: CVE-2025-66552
Creator: NVD / NIST
Published: 2025-12-05T17:16:05.687+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2025-66552 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.27%

17.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-778

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	>= 30.0.0, < 30.0.9
Nextcloud	Nextcloud Server	>= 31.0.0, < 31.0.1

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

Timeline

Published: Dec 5, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-66552?

How severe is CVE-2025-66552?

CVE-2025-66552 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2025-66552?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-66552?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST