UpHeron
All vulnerabilities

Servers and applications

CVE-2019-20866

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.

Severity
Medium 5.3
Published
19 Jun 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
5.12.0
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • Every version before 5.12.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-20866
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-20866