Missing per-channel team-scope check in ABAC access control policy unassign allows cross-team policy removal
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…
Severity medium: primary CNA CVSS 4.2 v3.1 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2026-08-17T14:36:56.282Z. Updated 2026-08-17T15:25:38.145Z.