CVE-2019-20866

Published: Jun 19, 2020Modified: Jun 17, 2026

5.3

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitability: 3.9 / Impact: 1.4

Source: NVD

Description

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 (1)

Products: Mattermost: Mattermost Server

Mattermost

1 product

Mattermost Server

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Mattermost Mattermost Server	Before 5.12.0

Related CWEs

CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References (2)

https://mattermost.com/security-updates/

Source: cve@mitre.org

Vendor Advisory

https://mattermost.com/security-updates/

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

Timeline

No history available yet.