CVE-2025-66552: nextcloud server — Fix

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.

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CVSS v3.1 Score

4.3

MEDIUM

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

Weakness Type (CWE)

CWE-778 CWE-778

Affected Products

Vendor	Product	Versions
nextcloud	nextcloud_server	30.0.0 — 30.0.9
nextcloud	nextcloud_server	30.0.0 — 30.0.9
nextcloud	nextcloud_server	31.0.0 — 31.0.1
nextcloud	nextcloud_server	31.0.0 — 31.0.1

References

Advisories & Patches

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

Other References

https://github.com/nextcloud/server/pull/50992

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-66552? +

CVE-2025-66552 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-66552? +

CVE-2025-66552 affects products from nextcloud, specifically: nextcloud_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66552? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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