Vulnerability identifier: #VU56367

Vulnerability risk: Medium

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-37630

CWE-ID: CWE-639

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nextcloud Circles
Server applications / Other server solutions

Vendor: Nextcloud

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the Secret Circle can be joined without approval. A remote authenticated attacker can join any Secret Circle without approval by the Circle owner.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nextcloud Circles: 0.19.0 - 0.21.3

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External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-56j9-3rj4-wvgm/

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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.