UpHeron
All vulnerabilities

Servers and applications

CVE-2019-20844

An issue was discovered in Mattermost Server before 5.18.0, 5.17.2, 5.16.4, 5.15.4, and 5.9.7. An attacker can spoof a direct-message channel by changing the type of a channel.

Severity
Medium 6.5
Published
19 Jun 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
5.9.7, 5.15.4, 5.16.4, 5.17.2
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • Version 5.18.0-rc4
  • Version 5.18.0-rc3
  • Version 5.18.0-rc2
  • Version 5.18.0-rc1
All 8 release lines
  • Every version before 5.9.7
  • From 5.15.0 before 5.15.4
  • From 5.16.0 before 5.16.4
  • From 5.17.0 before 5.17.2
  • Version 5.18.0-rc1
  • Version 5.18.0-rc2
  • Version 5.18.0-rc3
  • Version 5.18.0-rc4

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-20844
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-20844