Insufficient Logging in Nextcloud Server and Enterprise server

1) Insufficient Logging

EUVDB-ID: #VU119229

Risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-66552

CWE-ID: CWE-778 - Insufficient Logging

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the admin_audit does not log all actions on files in groupfolders. A remote user can perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 30.0.0 - 31.0.0

Nextcloud Enterprise Server: 30.0.0 - 31.0.0

CPE2.3

• cpe:2.3:a:nextcloud:nextcloud_server:30.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_server:30.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_server:30.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_enterprise_server:30.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_enterprise_server:30.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:nextcloud:nextcloud_enterprise_server:30.0.2:*:*:*:*:*:*:*

External links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-ww9m-f8j4-jj9x

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.