Description
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 PermissionCreateTeam but not PermissionInviteUser on the resulting team to configure invite-controlled team settings (make the team publicly joinable via open invite and/or constrain membership via allowed domains) that they are not permitted to set on an existing team via POST /api/v4/teams with allow_open_invite: true and/or a non-empty allowed_domains in the request body.. Mattermost Advisory ID: MMSA-2026-00655
Problem types
CWE-862: Missing Authorization
Product status
11.6.0 (semver)
11.5.0 (semver)
10.11.0 (semver)
10.11.0 (semver)
11.7.0
11.6.2
11.5.5
10.11.16
10.11.17
Credits
0x7oda7123
References
mattermost.com/security-updates (MMSA-2026-00655)