cve/2019/CVE-2019-20866.md

### [CVE-2019-20866](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-20866)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### 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.

### POC

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

#### Github
No PoCs found on GitHub currently.