Missing Authorization in Mattermost Server - CVE-2018-21257
Published: June 19, 2020 / Updated: August 8, 2020
Vulnerability identifier: #VU34219
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-21257
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to manipulate data.
An issue was discovered in Mattermost Server before 5.1. It allows attackers to bypass intended access restrictions (for setting a channel header) via the Channel header slash command API.
Affected software
Mattermost Server
How to mitigate CVE-2018-21257
Install update from vendor's website.
Mattermost Server - update to 5.1.0