Improper Certificate Validation in Mattermost Server - CVE-2017-18911
Published: June 19, 2020 / Updated: July 17, 2020
Vulnerability identifier: #VU30217
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2017-18911
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mattermost, Inc.
Affected software:
Mattermost Server
Mattermost Server
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. The X.509 certificate validation can be skipped for a TLS-based e-mail server.
How to mitigate CVE-2017-18911
Install update from vendor's website.