CVE-2026-6689

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

State: Published
Severity: 4.3 Medium
Published: Jun 12, 2026
Updated: Jun 12, 2026
Reserved: Apr 20, 2026

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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

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	Mattermost

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
MattermostMattermost	11.6.0 through 11.6.1Affected 11.5.0 through 11.5.4Affected 10.11.0 through 10.11.15Affected 10.11.0 through 10.11.16Affected 11.7.0Not affected 11.6.2Not affected 11.5.5Not affected 10.11.16Not affected 10.11.17Not affected

References

MMSA-2026-00655vendor-advisory

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