CVE-2025-66552 Nextcloud Server admin_audit does not log all actions on files in groupfolders

What is CVE-2025-66552?

CVE-2025-66552 is a medium-severity vulnerability in Nextcloud Nextcloud Server, published on 5 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-778

Which versions are affected by CVE-2025-66552?

1 open source package ship an affected version, including nextcloud. It affects 1 product.

Products include Nextcloud Nextcloud Server.

How do I fix CVE-2025-66552?

Upgrade nextcloud to a fixed version for your release line: 31.0.9 or 32.0.1.

Is CVE-2025-66552 being exploited?

There is no known exploitation of CVE-2025-66552 in the wild and no public exploit code.

Other vulnerabilities in Nextcloud Nextcloud Server

• CVE-2021-32802 Preview generation used third-party library not suited for user-generated content in Nextcloud server Critical 9.3
• CVE-2023-26482 Scope of workflow operations is not validated in nextcloud server Critical 9.1
• CVE-2018-3775 Auth bypass in Nextcloud Server High 8.8
• CVE-2023-35172 Nextcloud Server password reset endpoint is not brute force protected High 8.7
• CVE-2023-32320 Nextcloud Server's brute force protection allows someone to send more requests than intended High 8.7

All Nextcloud Nextcloud Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-nextcloud-2025-66552, GHSA-ww9m-f8j4-jj9x.