Medium severity4.2NVD Advisory· Published Aug 17, 2026· Updated Aug 17, 2026
CVE-2026-15754
CVE-2026-15754
Description
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
AI Insight
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Affected products
1- Range: <=11.7.6, <=11.8.3
Patches
Vulnerability mechanics
References
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