{"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": "2026-05-21T08:22:00.182Z"}, "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"}}}}

{}

{"cveTags": [], "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"}], "id": "CVE-2026-22880", "lastModified": "2026-05-21T09:16:26.510", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 4.0, "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}, "published": "2026-05-21T09:16:26.510", "references": [{"source": "responsibledisclosure@mattermost.com", "url": "https://mattermost.com/security-updates"}], "sourceIdentifier": "responsibledisclosure@mattermost.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-352"}], "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.0.37]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,11.0.4]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,11.1.3]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,11.3.2]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,10.11.11]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "2.38.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.5.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "2.37.1.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.4.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.3.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.2.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "10.11.12"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Mattermost", "source": "cna", "vendor": "Mattermost"}, "product": "mattermost", "vendor": "mattermost"}], "created": "2026-05-21T10:30:07.852986+00:00", "updated": "2026-05-21T10:30:08.109694+00:00", "vendors": ["mattermost", "mattermost$PRODUCT$mattermost"]}