UpHeron
All vulnerabilities

Servers and applications

CVE-2018-21251

An issue was discovered in Mattermost Server before 5.2 and 5.1.1. Authorization could be bypassed if the channel name were not the same in the params and the body.

Severity
Critical 9.8
Published
19 Jun 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
5.1.1
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • Version 5.2.0-rc6
  • Version 5.2.0-rc5
  • Version 5.2.0-rc4
  • Version 5.2.0-rc3
All 7 release lines
  • Every version before 5.1.1
  • Version 5.2.0-rc1
  • Version 5.2.0-rc2
  • Version 5.2.0-rc3
  • Version 5.2.0-rc4
  • Version 5.2.0-rc5
  • Version 5.2.0-rc6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2018-21251
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2018-21251