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CVE-2026-6689

Mattermost · Vulnerability

CVSS 3.1 4.3 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-6689

Published

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

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-6689

Published

Mattermost

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "product": "Mattermost",
                    "vendor": "Mattermost",
                    "versions": [
                        {
                            "lessThanOrEqual": "11.6.1",
                            "status": "affected",
                            "version": "11.6.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "11.5.4",
                            "status": "affected",
                            "version": "11.5.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "10.11.15",
                            "status": "affected",
                            "version": "10.11.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThanOrEqual": "10.11.16",
                            "status": "affected",
                            "version": "10.11.0",
                            "versionType": "semver"
                        },
                        {
                            "version": "11.7.0",
                            "status": "unaffected"
                        },
                        {
                            "version": "11.6.2",
                            "status": "unaffected"
                        },
                        {
                            "version": "11.5.5",
                            "status": "unaffected"
                        },
                        {
                            "version": "10.11.16",
                            "status": "unaffected"
                        },
                        {
                            "version": "10.11.17",
                            "status": "unaffected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON