Mattermost doesn't enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation

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

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-6689

• https://mattermost.com/security-updates

• mattermost/mattermost#36188

• mattermost/mattermost#36375

• mattermost/mattermost#36383

• mattermost/mattermost#36384

• mattermost/mattermost#36402

• mattermost/mattermost@2dea058

• mattermost/mattermost@3a96344

• mattermost/mattermost@479fc42

• mattermost/mattermost@7d6816a

• mattermost/mattermost@977c791

• https://github.com/mattermost/mattermost/releases/tag/v10.11.16

• https://github.com/mattermost/mattermost/releases/tag/v11.5.5

• https://github.com/mattermost/mattermost/releases/tag/v11.6.2

• https://github.com/mattermost/mattermost/releases/tag/v11.7.0