{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6739","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2026-04-21T08:47:06.795Z","datePublished":"2026-06-12T15:49:14.444Z","dateUpdated":"2026-06-13T03:56:06.666Z"},"containers":{"cna":{"affected":[{"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"}]}],"credits":[{"lang":"en","type":"finder","value":"NeganSpl01t"}],"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 require system-level permission when patching protected default system roles, which allows authenticated users with delegated user-management permissions to escalate privileges by altering built-in role permissions via the role patch API.. Mattermost Advisory ID: MMSA-2026-00656"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L","baseSeverity":"MEDIUM","baseScore":6.7},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","description":"CWE-863: Incorrect Authorization","cweId":"CWE-863"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00656","tags":["vendor-advisory"]}],"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-2026-00656","defect":["https://mattermost.atlassian.net/browse/MM-68392"],"discovery":"EXTERNAL"},"title":"Mattermost: Delegated admins could patch protected default system roles","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2026-06-12T15:49:14.444Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-12T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-6739"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-06-13T03:56:06.666Z"}}]}}