{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-4858", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-03-25T15:58:42.714Z", "datePublished": "2026-05-21T08:12:11.176Z", "dateUpdated": "2026-05-21T08:12:11.176Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "11.6.0", "status": "affected", "version": "11.6.0", "versionType": "semver"}, {"lessThanOrEqual": "11.5.3", "status": "affected", "version": "11.5.0", "versionType": "semver"}, {"lessThanOrEqual": "11.4.4", "status": "affected", "version": "11.4.0", "versionType": "semver"}, {"lessThanOrEqual": "10.11.14", "status": "affected", "version": "10.11.0", "versionType": "semver"}, {"version": "11.7.0", "status": "unaffected"}, {"version": "11.6.1", "status": "unaffected"}, {"version": "11.5.4", "status": "unaffected"}, {"version": "11.4.5", "status": "unaffected"}, {"version": "10.11.15", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "daw10"}], "descriptions": [{"lang": "en", "value": "Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H", "baseSeverity": "HIGH", "baseScore": 8}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "cweId": "CWE-22"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00640", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost to versions 11.7.0, 11.6.1, 11.5.4, 11.4.5, 10.11.15 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00640", "defect": ["https://mattermost.atlassian.net/browse/MM-68082"], "discovery": "EXTERNAL"}, "title": "Path traversal in integration action URL leading to arbitrary API execution via system admin\u2019s auth token.", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-05-21T08:12:11.176Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640"}], "id": "CVE-2026-4858", "lastModified": "2026-05-21T09:16:30.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 6.0, "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}, "published": "2026-05-21T09:16:30.143", "references": [{"source": "responsibledisclosure@mattermost.com", "url": "https://mattermost.com/security-updates"}], "sourceIdentifier": "responsibledisclosure@mattermost.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "11.6.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.5.0,11.5.3]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.4.0,11.4.4]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.11.0,10.11.14]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.6.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.5.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.4.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "10.11.15"}}], "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": "2026-05-21T10:30:07.854367+00:00", "updated": "2026-05-21T11:00:11.854812+00:00", "vendors": ["mattermost", "mattermost$PRODUCT$mattermost"]}