{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-11777","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2025-10-15T11:37:25.782Z","datePublished":"2025-11-13T17:32:03.975Z","dateUpdated":"2025-11-13T18:01:46.459Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"10.11.3","status":"affected","version":"10.11.0","versionType":"semver"},{"lessThanOrEqual":"10.5.11","status":"affected","version":"10.5.0","versionType":"semver"},{"version":"11.0.0","status":"unaffected"},{"version":"10.11.4","status":"unaffected"},{"version":"10.5.12","status":"unaffected"}]}],"credits":[{"lang":"en","type":"finder","value":"Xiangyu Guo"}],"descriptions":[{"lang":"en","value":"Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N","baseSeverity":"LOW","baseScore":3.1},"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"}],"solutions":[{"value":"Update Mattermost to versions 11.0.0, 10.11.4, 10.5.12 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2025-00518","defect":["https://mattermost.atlassian.net/browse/MM-64661"],"discovery":"EXTERNAL"},"title":"Cross-team channel membership access","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2025-11-13T17:32:03.975Z"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-11-13T18:01:38.258075Z","id":"CVE-2025-11777","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":"2025-11-13T18:01:46.459Z"}}]}}