{"id":"CVE-2026-5139","revision":"7c9168fd64bb4adf8d89294a11ae7f53","records":[{"revision":"7c9168fd64bb4adf8d89294a11ae7f53","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-5139","aliases":[],"title":"GitLab Plugin Allows Non-Admin Users to Modify Default Instance Configuration","description":"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","state":0,"publishedAt":"2026-06-22T13:34:21.247+00:00","modifiedAt":"2026-06-22T15:39:29.821+00:00","affected":[{"ecosystem":"Vendor product","name":"Mattermost","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"product\": \"Mattermost\",\n                    \"vendor\": \"Mattermost\",\n                    \"versions\": [\n                        {\n                            \"lessThanOrEqual\": \"11.7.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"11.7.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"11.6.2\",\n                            \"status\": \"affected\",\n                            \"version\": \"11.6.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"11.5.5\",\n                            \"status\": \"affected\",\n                            \"version\": \"11.5.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"10.11.17\",\n                            \"status\": \"affected\",\n                            \"version\": \"10.11.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"11.8.0\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"11.7.1\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"11.6.3\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"11.5.6\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"10.11.18\",\n                            \"status\": \"unaffected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","score":5.4,"severity":"MEDIUM"}],"references":["https://mattermost.com/security-updates"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-5139","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-5139","identifiers":["CVE-2026-5139"]},"retained":false,"historicalAffected":[]}],"coverage":[]}