{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-1628", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-01-29T15:14:51.993Z", "datePublished": "2026-03-02T13:24:21.391Z", "dateUpdated": "2026-03-02T13:24:21.391Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "5.13.3", "status": "affected", "version": "0", "versionType": "semver"}, {"version": "5.13.4.0", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "N/A"}], "descriptions": [{"lang": "en", "value": "Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Mattermost app which allows a malicious server to expose preload script functionality to untrusted servers via having a user open an external link in their Mattermost server. Mattermost Advisory ID: MMSA-2026-00596"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "baseSeverity": "MEDIUM", "baseScore": 4.6}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-829: Inclusion of Functionality from Untrusted Control Sphere", "cweId": "CWE-829"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00596", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost Desktop App to versions 5.13.4.0 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00596", "defect": ["https://mattermost.atlassian.net/browse/MM-67374"], "discovery": "EXTERNAL"}, "title": "Mattermost allows external websites to open within the app, exposing preload functionality to non-trusted sites.", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-03-02T13:24:21.391Z"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Mattermost app which allows a malicious server to expose preload script functionality to untrusted servers via having a user open an external link in their Mattermost server. Mattermost Advisory ID: MMSA-2026-00596"}], "id": "CVE-2026-1628", "lastModified": "2026-03-02T14:16:23.223", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 2.5, "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}, "published": "2026-03-02T14:16:23.223", "references": [{"source": "responsibledisclosure@mattermost.com", "url": "https://mattermost.com/security-updates"}], "sourceIdentifier": "responsibledisclosure@mattermost.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-829"}], "source": "responsibledisclosure@mattermost.com", "type": "Secondary"}]}

{}

{}