CVE-2026-6739

Mattermost CVE-2026-6739 affects multiple release lines: 11.6.x up to 11.6.1, 11.5.x up to 11.5.4, and 10.11.x up to 10.11.15/16. The issue is that patching protected default system roles via the role patch API does not require system-level permission. This permits authenticated users with delega...