Input validation error in Mattermost Server - CVE-2018-21259

 

Input validation error in Mattermost Server - CVE-2018-21259

Published: June 19, 2020 / Updated: July 17, 2020


Vulnerability identifier: #VU30228
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-21259
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

An issue was discovered in Mattermost Server before 4.10.1, 4.9.4, and 4.8.2. It allows attackers to cause a denial of service (application hang) via a malformed link in a channel.


Affected software

Mattermost Server

How to mitigate CVE-2018-21259

Install update from vendor's website.

Mattermost Server - update to 4.10.1

External References

Related Security Bulletins