Vulnerability identifier: #VU77660

Vulnerability risk: High

CVSSv3.1: 7.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-32320

CWE-ID: CWE-307

Exploitation vector: Network

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 remote attacker to compromise the target system.

The vulnerability exists due to missing brute force protection. A remote user can brute-force authentication on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Enterprise Server: 21.0.0 - 26.0.1

Nextcloud Server: 25.0.0 - 26.0.1

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External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-qphh-6xh7-vffg
http://github.com/nextcloud/server/pull/38274
http://hackerone.com/reports/1918525

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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