CVE-2026-6689: Missing Authorization

Mattermost versions 11.6.x = 11.6.1, 11.5.x = 11.5.4, 10.11.x = 10.11.15, 10.11.x = 10.11.16 Fail to enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation the check was only applied on update/patch, which allows an authenticated user holding...

CVE-2025-47870: Missing Authentication for Critical Function

Mattermost versions 10.8.x = 10.8.3, 10.5.x = 10.5.8, 9.11.x = 9.11.17, 10.9.x = 10.9.2 fail to sanitize the team invite ID in the POST /api/v4/teams/:teamId/restore endpoint which allows an team admin with no member invite privileges to get the team’s invite id...

CVE-2023-3584

Mattermost CVE-2023-3584 affects the POST /api/v4/teams endpoint. The root cause is improper authorization checks when a team override scheme ID is supplied, enabling an authenticated attacker who knows a valid Team Override Scheme ID to create a new team using that scheme. Documents consistently...