Inconsistent interpretation of HTTP requests in Mattermost Server - CVE-2019-20866
Published: June 19, 2020 / Updated: August 8, 2020
Vulnerability identifier: #VU34232
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-20866
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.
An issue was discovered in Mattermost Server before 5.12.0. Use of a Proxy HTTP header, rather than the source address in an IP packet header, for obtaining IP address information was mishandled.
Affected software
Mattermost Server
How to mitigate CVE-2019-20866
Install update from vendor's website.
Mattermost Server - update to 5.12.0