| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0, < 10.11.5≥ 10.12.0, < 10.12.2≥ 10.5.0, < 10.5.13≥ 11.0.0, < 11.0.4all versions | 10.11.510.12.210.5.1311.0.4 |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | < 8.0.0-20251028000919-d3ed703dc833 | 8.0.0-20251028000919-d3ed703dc833 |
| mattermost server | ≥ 10.11.0, < 10.11.5≥ 10.12.0, < 10.12.2≥ 10.5.0, < 10.5.13≥ 11.0.0, < 11.0.4 | 10.11.510.12.210.5.1311.0.4 |
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.
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