{"id":"CVE-2026-6689","state":"PUBLISHED","title":"*Missing* {{invite_user}} *permission check on team creation allows unprivileged users to set open-invite and allowed-domains team settings*","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","publishedAt":"2026-06-12T15:51:30.871Z","updatedAt":"2026-06-12T17:18:52.426Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","source":"Mattermost"},"assigner":"Mattermost","products":["Mattermost Mattermost"],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"11.6.0","status":"affected","lessThanOrEqual":"11.6.1","versionType":"semver"},{"version":"11.5.0","status":"affected","lessThanOrEqual":"11.5.4","versionType":"semver"},{"version":"10.11.0","status":"affected","lessThanOrEqual":"10.11.15","versionType":"semver"},{"version":"10.11.0","status":"affected","lessThanOrEqual":"10.11.16","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"}]}],"references":["https://mattermost.com/security-updates"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/6xxx/CVE-2026-6689.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6689","state":"PUBLISHED","datePublished":"2026-06-12T15:51:30.871Z","dateUpdated":"2026-06-12T17:18:52.426Z","assignerShortName":"Mattermost","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateReserved":"2026-04-20T15:19:13.503Z"},"containers":{"cna":{"title":"*Missing* {{invite_user}} *permission check on team creation allows unprivileged users to set open-invite and allowed-domains team settings*","descriptions":[{"lang":"en","value":"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":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"11.6.0","status":"affected","lessThanOrEqual":"11.6.1","versionType":"semver"},{"version":"11.5.0","status":"affected","lessThanOrEqual":"11.5.4","versionType":"semver"},{"version":"10.11.0","status":"affected","lessThanOrEqual":"10.11.15","versionType":"semver"},{"version":"10.11.0","status":"affected","lessThanOrEqual":"10.11.16","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"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00655","tags":["vendor-advisory"]}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","baseSeverity":"MEDIUM","baseScore":4.3},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","type":"CWE","description":"CWE-862: Missing Authorization"}]}],"providerMetadata":{"shortName":"Mattermost","orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateUpdated":"2026-06-12T15:51:30.871Z"},"credits":[{"lang":"en","type":"finder","value":"0x7oda7123"}],"solutions":[{"value":"Update Mattermost to versions 11.7.0, 11.6.2, 11.5.5, 10.11.16, 10.11.17 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2026-00655","defect":["https://mattermost.atlassian.net/browse/MM-68381"],"discovery":"EXTERNAL"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-12T17:18:46.355666Z","id":"CVE-2026-6689","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-12T17:18:52.426Z"}}]}}}