{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-5139", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-03-30T11:29:16.698Z", "datePublished": "2026-06-22T13:34:21.247Z", "dateUpdated": "2026-06-22T13:34:21.247Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "11.7.0", "status": "affected", "version": "11.7.0", "versionType": "semver"}, {"lessThanOrEqual": "11.6.2", "status": "affected", "version": "11.6.0", "versionType": "semver"}, {"lessThanOrEqual": "11.5.5", "status": "affected", "version": "11.5.0", "versionType": "semver"}, {"lessThanOrEqual": "10.11.17", "status": "affected", "version": "10.11.0", "versionType": "semver"}, {"version": "11.8.0", "status": "unaffected"}, {"version": "11.7.1", "status": "unaffected"}, {"version": "11.6.3", "status": "unaffected"}, {"version": "11.5.6", "status": "unaffected"}, {"version": "10.11.18", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "hunterxluxhug"}], "descriptions": [{"lang": "en", "value": "Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler, which allows any authenticated user to overwrite the global default GitLab instance configuration via the {{/gitlab connect <instance-name>}} slash command.. Mattermost Advisory ID: MMSA-2026-00644"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L", "baseSeverity": "MEDIUM", "baseScore": 5.4}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-862: Missing Authorization", "cweId": "CWE-862"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00644", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost to versions 11.8.0, 11.7.1, 11.6.3, 11.5.6, 10.11.18 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00644", "defect": ["https://mattermost.atlassian.net/browse/MM-68132"], "discovery": "EXTERNAL"}, "title": "GitLab Plugin Allows Non-Admin Users to Modify Default Instance Configuration", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-06-22T13:34:21.247Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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{"created": "2026-06-22T15:15:03.468376+00:00", "updated": "2026-06-22T15:15:03.468383+00:00", "vendors": []}