Security Advisory

CVE-2026-15754

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-17 14:36:56

Last updated 2026-08-17 15:25:38

Assigner Mattermost

CVSS score 4.2

State PUBLISHED

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

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