{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-3433","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2026-03-02T12:48:20.745Z","datePublished":"2026-06-12T15:46:54.868Z","dateUpdated":"2026-06-12T17:19:49.970Z"},"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":"0x7oda7123"}],"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 restrict role_updated websocket event broadcasts to members of the affected team or channel which allows an authenticated attacker with guest-level access to observe permission scheme change notifications for private teams they are not a member of via the websocket connection.. Mattermost Advisory ID: MMSA-2026-00616"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","baseSeverity":"MEDIUM","baseScore":4.3},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","description":"CWE-200 Exposure of Sensitive Information to an Unauthorized Actor","cweId":"CWE-200"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00616","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-2026-00616","defect":["https://mattermost.atlassian.net/browse/MM-67740"],"discovery":"EXTERNAL"},"title":"Mattermost fails to scope role_updated websocket events to authorized team and channel members","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2026-06-12T15:46:54.868Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-12T17:19:43.952848Z","id":"CVE-2026-3433","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-06-12T17:19:49.970Z"}}]}}