Vulnerability identifier: #VU73916

Vulnerability risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-25820

CWE-ID: CWE-307

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Nextcloud Enterprise Server
Client/Desktop applications / Messaging software
Nextcloud Server
Client/Desktop applications / Messaging software

Vendor: Nextcloud

Description

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to improper restriction of excessive authentication attempts on password confirmation modal. A local user can brute force the password on the confirmation endpoint.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Enterprise Server: 21.0.9.0 - 25.0.3

Nextcloud Server: 24.0.0 - 25.0.3

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External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-36g6-wjx2-333x

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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