| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | = 11.10.0≥ 11.7.0, < 11.7.10≥ 11.8.0, < 11.8.6≥ 11.9.0, < 11.9.2 | 11.7.1011.8.611.9.2 |
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to reject OAuth application sessions in the account type switch endpoint, which allows an attacker with a valid OAuth bearer token for a target user to permanently take over that user's SSO-backed account by setting an attacker-controlled password and detaching the account from its identity provider via a crafted request to POST /api/v4/users/login/switch.. Mattermost Advisory ID: MMSA-2026-00758
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