Account takeover on OAuth/OpenID-enabled servers
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
| Type | CWE ID | Description |
|---|
| CWE | CWE-303 | CWE-303: Incorrect Implementation of Authentication Algorithm |
Type: CWE
Description: CWE-303: Incorrect Implementation of Authentication Algorithm
Metrics
| Version | Base score | Base severity | Vector |
|---|
| 3.1 | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
Version: 3.1
Base score: 9.9
Base severity: CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H