Improper access control in Nextcloud Server and Enterprise Server



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-48239
CWE-ID CWE-284
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Nextcloud Enterprise Server
Client/Desktop applications / Messaging software

Nextcloud Server
Client/Desktop applications / Messaging software

Vendor Nextcloud

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Improper access control

EUVDB-ID: #VU83360

Risk: Medium

CVSSv4.0: 5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-48239

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

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

CPE2.3 External links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f962-hw26-g267


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.



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