CVE-2026-15754

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

Score
CVSS 3.1 4.2 Medium
Status
Analyzed - responsibledisclosure@mattermost.com
Published
2026-08-17
Last modified
2026-08-17
Weaknesses
CWE-863

Affected products

References

 
 
© AVABIS GmbH privacypolicy about