{"id":"CVE-2025-49222","state":"PUBLISHED","title":"Mattermost Shared Channel Upload Type Validation Bypass","description":"Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in arbitrary filesystem directories.","publishedAt":"2025-08-21T07:59:45.057Z","updatedAt":"2025-08-21T13:57:13.759Z","severity":{"score":6.8,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N","source":"Mattermost"},"assigner":"Mattermost","products":["Mattermost Mattermost"],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"10.8.0","status":"affected","lessThanOrEqual":"10.8.3","versionType":"semver"},{"version":"10.5.0","status":"affected","lessThanOrEqual":"10.5.8","versionType":"semver"},{"version":"9.11.0","status":"affected","lessThanOrEqual":"9.11.17","versionType":"semver"},{"version":"10.9.0","status":"affected","lessThanOrEqual":"10.9.2","versionType":"semver"},{"version":"10.10.0","status":"affected","lessThanOrEqual":"10.10.0","versionType":"semver"},{"version":"10.11.0","status":"unaffected"},{"version":"10.8.4","status":"unaffected"},{"version":"10.5.9","status":"unaffected"},{"version":"9.11.18","status":"unaffected"},{"version":"10.9.3","status":"unaffected"},{"version":"10.10.1","status":"unaffected"}]}],"references":["https://mattermost.com/security-updates"],"weaknesses":["CWE-434"],"ingestedAt":"2026-10-29T20:09:23.771Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/49xxx/CVE-2025-49222.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-49222","state":"PUBLISHED","datePublished":"2025-08-21T07:59:45.057Z","dateUpdated":"2025-08-21T13:57:13.759Z","assignerShortName":"Mattermost","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateReserved":"2025-07-22T07:46:53.179Z"},"containers":{"cna":{"title":"Mattermost Shared Channel Upload Type Validation Bypass","descriptions":[{"lang":"en","value":"Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in arbitrary filesystem directories."}],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"10.8.0","status":"affected","lessThanOrEqual":"10.8.3","versionType":"semver"},{"version":"10.5.0","status":"affected","lessThanOrEqual":"10.5.8","versionType":"semver"},{"version":"9.11.0","status":"affected","lessThanOrEqual":"9.11.17","versionType":"semver"},{"version":"10.9.0","status":"affected","lessThanOrEqual":"10.9.2","versionType":"semver"},{"version":"10.10.0","status":"affected","lessThanOrEqual":"10.10.0","versionType":"semver"},{"version":"10.11.0","status":"unaffected"},{"version":"10.8.4","status":"unaffected"},{"version":"10.5.9","status":"unaffected"},{"version":"9.11.18","status":"unaffected"},{"version":"10.9.3","status":"unaffected"},{"version":"10.10.1","status":"unaffected"}]}],"references":[{"url":"https://mattermost.com/security-updates"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N","baseSeverity":"MEDIUM","baseScore":6.8},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-434","lang":"en","type":"CWE","description":"CWE-434: Unrestricted Upload of File with Dangerous Type"}]}],"providerMetadata":{"shortName":"Mattermost","orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateUpdated":"2025-08-21T07:59:45.057Z"},"credits":[{"lang":"en","type":"finder","value":"daw10"}],"solutions":[{"value":"Update Mattermost to versions 10.11.0, 10.8.4, 10.5.9, 9.11.18, 10.9.3, 10.10.1 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2025-00505","defect":["https://mattermost.atlassian.net/browse/MM-64779"],"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-08-21T13:57:06.140700Z","id":"CVE-2025-49222","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":"2025-08-21T13:57:13.759Z"}}]}}}