Vulnerability identifier: #VU56355

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-2021-37631

CWE-ID: N/A

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Deck
Mobile applications / Apps for mobile phones

Vendor: Nextcloud

Description

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

The vulnerability exists due to the affected application does not properly check membership of users in a Circle. A remote authenticated attacker can gain access to boards that have been shared with a Circle, even if the user was not a member of the circle.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Deck: 1.2.0 - 1.5.0

---

External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-4mxp-j277-82hr/

---

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.