| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | ≥ 11.7.0, < 11.7.7≥ 11.8.0, < 11.8.4 | 11.7.711.8.4 |
Mattermost versions 11.7.x <= 11.7.6, 11.8.x <= 11.8.3 The access control policy unassign endpoint fails to re-validate that each target channel still belongs to the requesting admin's team, which allows an authenticated team administrator to remove ABAC (attribute-based access control) policy assignments from channels outside their team via the policy unassign API after a channel has been moved to another team.. Mattermost Advisory ID: MMSA-2026-00718
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