| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0-rc1+incompatible, < 10.11.11+incompatible≥ 11.2.0-rc1+incompatible, < 11.2.3+incompatible≥ 11.3.0-rc1+incompatible, < 11.3.2+incompatible≥ 11.4.0-rc1+incompatible, < 11.4.1+incompatible | 10.11.11+incompatible11.2.3+incompatible11.3.2+incompatible11.4.1+incompatible |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | ≥ 10.11.0-rc1, < 10.11.11≥ 11.2.0-rc1, < 11.2.3≥ 11.3.0-rc1, < 11.3.2≥ 11.4.0-rc1, < 11.4.1≥ 8.0.0-20260105080200-d27a2195068d, < 10.11.11≥ 8.0.0-20260105080200-d27a2195068d | 10.11.1111.2.311.3.211.4.1 |
| mattermost server | ≥ 10.11.0, < 10.11.11≥ 11.2.0, < 11.2.3≥ 11.3.0, < 11.3.2≥ 11.4.0, < 11.4.1 | 10.11.1111.2.311.3.211.4.1 |
Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to properly validate CSRF tokens in the /api/v4/access_control_policies/{policy_id}/activate endpoint, which allows an attacker to trick an admin into changing access control policy active status via a crafted request. Mattermost Advisory ID: MMSA-2026-00578
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