Description
Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.
Problem types
CWE-303: Incorrect Implementation of Authentication Algorithm
Product status
10.12.0 (semver)
10.11.0 (semver)
10.5.0 (semver)
11.0.0 (semver)
11.1.0
10.12.2
10.11.5
10.5.13
11.0.4
Credits
daw10
References
mattermost.com/security-updates
