{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-0998","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2026-01-15T15:58:22.233Z","datePublished":"2026-02-16T09:54:24.732Z","dateUpdated":"2026-02-17T15:00:44.691Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"11.1.2","status":"affected","version":"11.1.0","versionType":"semver"},{"lessThanOrEqual":"10.11.9","status":"affected","version":"10.11.0","versionType":"semver"},{"lessThanOrEqual":"11.2.1","status":"affected","version":"11.2.0","versionType":"semver"},{"version":"11.3.0","status":"unaffected"},{"version":"11.1.3","status":"unaffected"},{"version":"10.11.10","status":"unaffected"},{"version":"11.2.2","status":"unaffected"}]}],"credits":[{"lang":"en","type":"finder","value":"daw10"}],"descriptions":[{"lang":"en","value":"Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 and Mattermost Plugin Zoom versions <=1.11.0 fail to validate user identity and post ownership in the {{/api/v1/askPMI}} endpoint which allows unauthorized users to start Zoom meetings as any user and overwrite arbitrary posts via direct API calls with manipulated user IDs and post data.. Mattermost Advisory ID: MMSA-2025-00534"}],"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":[{"lang":"en","type":"CWE","description":"CWE-862: Missing Authorization","cweId":"CWE-862"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2025-00534","tags":["vendor-advisory"]}],"solutions":[{"value":"Update Mattermost to versions 11.3.0, 11.1.3, 10.11.10, 11.2.2 or higher. Alternatively, update Mattermost Zoom Plugin to version 1.12.0 or higher","lang":"en"}],"source":{"advisory":"MMSA-2025-00534","defect":["https://mattermost.atlassian.net/browse/MM-66136"],"discovery":"EXTERNAL"},"title":"Mattermost Zoom Plugin allows unauthorized meeting creation and post modification via insufficient API access controls","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2026-02-16T09:54:24.732Z"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-17T15:00:37.795086Z","id":"CVE-2026-0998","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":"2026-02-17T15:00:44.691Z"}}]}}