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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-6689

*Missing* {{invite_user}} *permission check on team creation allows unprivileged users to set open-invite and allowed-domains team settings*

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Status
Published
Published
Updated
Assigning organization
Mattermost

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

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • 11.6.0 to ≤ 11.6.1affected
  • 11.5.0 to ≤ 11.5.4affected
  • 10.11.0 to ≤ 10.11.15affected
  • 10.11.0 to ≤ 10.11.16affected
  • 11.7.0unaffected
  • 11.6.2unaffected
  • 11.5.5unaffected
  • 10.11.16unaffected
  • 10.11.17unaffected

References