#VU49556 Improper Authorization in Mattermost Server

Vulnerability identifier: #VU49556

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mattermost Server
Client/Desktop applications / Messaging software

Vendor: Mattermost, Inc.

Description

The vulnerability allows a remote user to bypass implemented security restrictions.

The vulnerability exists due to unspecified error related to partial failure in permission level enforcement for high-availability configurations during an active session. A remote user can gain access to restricted resources under certain conditions within an active session.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mattermost Server:

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External links
https://mattermost.com/security-updates/#MMSA-2020-0040

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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.