| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | ≥ 10.13.0, ≤ 10.13.11≥ 11.1.0, ≤ 11.1.5≥ 11.3.0, ≤ 11.3.4 |
Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to appropriately check for valid namespaces which allows plugin users to create subscriptions to groups that were not whitelisted via creating groups that share the same prefix as a whitelisted group. Mattermost Advisory ID: MMSA-2026-00601
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