{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-22880","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2026-02-23T22:07:32.793Z","datePublished":"2026-05-21T08:22:00.182Z","dateUpdated":"2026-05-21T12:39:30.334Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"2.0.37","status":"affected","version":"0","versionType":"semver"},{"lessThanOrEqual":"11.0.4","status":"affected","version":"0","versionType":"semver"},{"lessThanOrEqual":"11.1.3","status":"affected","version":"0","versionType":"semver"},{"lessThanOrEqual":"11.3.2","status":"affected","version":"0","versionType":"semver"},{"lessThanOrEqual":"10.11.11","status":"affected","version":"0","versionType":"semver"},{"version":"2.38.0","status":"unaffected"},{"version":"11.5.0","status":"unaffected"},{"version":"2.37.1.0","status":"unaffected"},{"version":"11.4.1","status":"unaffected"},{"version":"11.3.2","status":"unaffected"},{"version":"11.2.4","status":"unaffected"},{"version":"10.11.12","status":"unaffected"}]}],"credits":[{"lang":"en","type":"finder","value":"Doyensec"}],"descriptions":[{"lang":"en","value":"Mattermost Mobile Apps versions <=2.37 11.4 2.0.37 11.0.4 11.1.3 11.3.2 10.11.11.0 fail to properly validate the SSO authentication callback origin which allows an attacker controlling a malicious Mattermost server to steal user credentials for a legitimate Mattermost server via relaying the SSO code exchange flow through the mobile application. Mattermost Advisory ID: MMSA-2025-00564"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N","baseSeverity":"MEDIUM","baseScore":6.1},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","description":"CWE-352: Cross-Site Request Forgery (CSRF)","cweId":"CWE-352"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2025-00564","tags":["vendor-advisory"]}],"solutions":[{"value":"Update Mattermost Mobile Apps to versions 2.38.0, 11.5.0, 2.37.1.0, 11.4.1, 11.3.2, 11.2.4, 10.11.12 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2025-00564","defect":["https://mattermost.atlassian.net/browse/MM-66812"],"discovery":"EXTERNAL"},"title":"Mobile SSO authentication flow allows credential theft via malicious server","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2026-05-21T08:22:00.182Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-21T12:39:11.362984Z","id":"CVE-2026-22880","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":"2026-05-21T12:39:30.334Z"}}]}}