Vulnerability identifier: #VU75399

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-30539

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 set up workflows using restricted and invisible system tags.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Enterprise Server: 21.0.0 - 25.0.4

Nextcloud Server: 24.0.0 - 25.0.4

---

External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-3m2f-v8x7-9w99
http://hackerone.com/reports/1895976
http://github.com/nextcloud/server/pull/37252
http://github.com/nextcloud/files_automatedtagging/pull/705

---

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.