What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-05 · updated 2026-10-18
• Weakness: CWE-778

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.

Affected products

• Nextcloud Server: from 30.0.0 before 30.0.9; from 31.0.0 before 31.0.1 — fixed in 30.0.9, 31.0.1

How to fix

Upgrade to a fixed version: Nextcloud Server 30.0.9, 31.0.1. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-ww9m-f8j4-jj9x
• https://github.com/nextcloud/server/commit/7cc005c43c72bc384848cf8cb851895827c412f6
• https://github.com/nextcloud/server/pull/50992
• https://hackerone.com/reports/2890071

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