Vulnerability identifier: #VU83360

Vulnerability risk: Medium

CVSSv3.1: 7.4 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-48239

CWE-ID: CWE-284

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 gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote user can update any personal or global external storage and make them inaccessible for everyone else as well.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Enterprise Server: 20.0.0 - 27.1.2

Nextcloud Server: 25.0.0 - 27.1.2

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External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-f962-hw26-g267

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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.