{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-1046", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-01-16T16:24:48.693Z", "datePublished": "2026-02-16T12:10:38.668Z", "dateUpdated": "2026-02-16T12:10:38.668Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "6.2.0", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.2.13", "status": "affected", "version": "0", "versionType": "semver"}, {"version": "6.1.0", "status": "unaffected"}, {"version": "6.0.3.0", "status": "unaffected"}, {"version": "5.13.3.0", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "hackerman70000"}], "descriptions": [{"lang": "en", "value": "Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user\u2019s system via the user clicking on certain items in the Help menu Mattermost Advisory ID: MMSA-2026-00577"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "LOW", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L", "baseSeverity": "HIGH", "baseScore": 7.6}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-939: Improper Authorization in Handler for Custom URL Scheme", "cweId": "CWE-939"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00577", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost Desktop App to versions 6.1.0, 6.0.3.0, 5.13.3.0 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00577", "defect": ["https://mattermost.atlassian.net/browse/MM-67103"], "discovery": "EXTERNAL"}, "title": "Arbitrary application execution via unvalidated server-controlled URLs in Help menu", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-02-16T12:10:38.668Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user\u2019s system via the user clicking on certain items in the Help menu Mattermost Advisory ID: MMSA-2026-00577"}], "id": "CVE-2026-1046", "lastModified": "2026-02-16T13:16:00.793", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 4.7, "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}, "published": "2026-02-16T13:16:00.793", "references": [{"source": "responsibledisclosure@mattermost.com", "url": "https://mattermost.com/security-updates"}], "sourceIdentifier": "responsibledisclosure@mattermost.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-939"}], "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}

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