Vulnerabilities CVE-2026-15754

CVE-2026-15754

Medium

Open

TLP:CLEAR

Missing per-channel team-scope check in ABAC access control policy unassign allows cross-team policy removal

NVD CVE.org

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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

Details

CVSS Score: 4.2
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:N
Confidence: 90%
Published: Aug 17, 2026
Last Modified: Aug 17, 2026

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