Vulnerability identifier: #VU85591

Vulnerability risk: Low

CVSSv3.1: 2.6 [CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-22403

CWE-ID: CWE-657

Exploitation vector: Network

Exploit availability: No

Vulnerable 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 OAuth2 authorization codes are valid indefinetly. A remote user can gain access to an authorization code and could authenticate at any time using the code.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Server: 0.0.2 - 27.1.5

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External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-wppc-f5g8-vx36
http://github.com/nextcloud/server/pull/40766
http://hackerone.com/reports/1784162

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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.