Vulnerability Database

322,905

Total vulnerabilities in the database

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.

  • Published: Jun 19, 2020
  • Updated: Nov 9, 2025
  • CVE: CVE-2018-21251
  • Severity: Critical
  • Exploit:

CVSS v3:

  • Severity: Critical
  • Score: 9.8
  • AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/Au:N/C:P/I:P/A:P

CWEs:

Software From Fixed in
mattermost / mattermost_server 5.2.0-rc2 5.2.0-rc2.x
mattermost / mattermost_server 5.2.0-rc3 5.2.0-rc3.x
mattermost / mattermost_server 5.2.0-rc4 5.2.0-rc4.x
mattermost / mattermost_server 5.2.0-rc5 5.2.0-rc5.x
mattermost / mattermost_server 5.2.0-rc6 5.2.0-rc6.x
mattermost / mattermost_server 5.2.0-rc1 5.2.0-rc1.x
mattermost / mattermost_server - 5.1.1