{"id":"GHSA-6hxm-w4hv-vgvw","summary":"Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints","details":"Mattermost versions 11.6.x \u003c= 11.6.1, 11.5.x \u003c= 11.5.4, 10.11.x \u003c= 10.11.15, 10.11.x \u003c= 10.11.16 fail to require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group members to team or channel admin via crafted API requests. Mattermost Advisory ID: MMSA-2026-00665","aliases":["CVE-2026-7387","GO-2026-6280"],"modified":"2026-08-25T20:25:45.443923114Z","published":"2026-06-12T18:31:59Z","database_specific":{"nvd_published_at":"2026-06-12T17:16:27Z","cwe_ids":["CWE-863"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-08-24T21:51:47Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-7387"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/36434"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/36432"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/36431"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/36423"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/pull/36316"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/d5f29c8ebbeb04460d16d9e2635ce50deeb78428"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/a9e574a82633915f22071f0d7ca2b006f249ec2a"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/8c72083414e675c97987374395e36d1f36b4bd8a"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/202d125afa87fe39611686850fd82590c99ca344"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/1ce2484a00c9821ee19708d2c46720e4855033a9"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/releases/tag/v10.11.16"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/releases/tag/v11.5.5"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/releases/tag/v11.6.2"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/releases/tag/v11.7.0"},{"type":"WEB","url":"https://mattermost.com/security-updates"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"}],"affected":[{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"11.6.0"},{"fixed":"11.6.1"}]}],"versions":["11.6.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6hxm-w4hv-vgvw/GHSA-6hxm-w4hv-vgvw.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"11.5.0"},{"fixed":"11.5.5"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 11.5.4","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6hxm-w4hv-vgvw/GHSA-6hxm-w4hv-vgvw.json"}},{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost-server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.11.0"},{"fixed":"10.11.17"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 10.11.15","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6hxm-w4hv-vgvw/GHSA-6hxm-w4hv-vgvw.json"}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.0.0-20250731163400-5b955468ea1e"},{"fixed":"8.0.0-20260506065351-202d125afa87"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-6hxm-w4hv-vgvw/GHSA-6hxm-w4hv-vgvw.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}