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