Input validation error in Mattermost Server - CVE-2017-18920
Published: June 19, 2020 / Updated: August 8, 2020
Vulnerability identifier: #VU34209
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-18920
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 execute arbitrary code.
An issue was discovered in Mattermost Server before 3.6.2. The WebSocket feature does not follow the Same Origin Policy.
Affected software
Mattermost Server
How to mitigate CVE-2017-18920
Install update from vendor's website.
Mattermost Server - update to 3.6.2