{"id":"CVE-2026-16048","aliases":["EUVD-2026-60206","GHSA-v37p-g38w-w7wg"],"status":"published","title":"Channel member roles accept out-of-scope roles","description":"Mattermost versions 11.8.x \u003c= 11.8.2, 11.7.x \u003c= 11.7.6, 10.11.x \u003c= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697","severity":{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0026,"percentile":0.17831,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-863"],"published":"2026-08-17T14:22:43Z","modified":"2026-10-28T02:30:29Z","products":[{"vendor":"mattermost","product":"mattermost"},{"vendor":"mattermost","product":"mattermost_server"}],"references":[{"url":"https://mattermost.com/security-updates","tags":["vendor-advisory","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16048","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-v37p-g38w-w7wg"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16048.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-16048","title":"Channel member roles accept out-of-scope roles","description":"Mattermost versions 11.8.x \u003c= 11.8.2, 11.7.x \u003c= 11.7.6, 10.11.x \u003c= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697","status":"published","published":"2026-08-17T14:22:43.94Z","modified":"2026-08-17T15:37:17.479Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:20:10.870108Z"}],"euvd":[{"id":"EUVD-2026-60206","description":"Mattermost versions 11.8.x \u003c= 11.8.2, 11.7.x \u003c= 11.7.6, 10.11.x \u003c= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697","status":"published","published":"2026-08-17T14:22:43Z","modified":"2026-08-17T15:37:17Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T18:01:49.335011Z"}],"ghsa":[{"id":"GHSA-v37p-g38w-w7wg","title":"Mattermost versions 11.8.x \u003c= 11.8.2, 11.7.x \u003c= 11.7.6, 10.11.x \u003c= 10.11.21 fail to restrict...","description":"Mattermost versions 11.8.x \u003c= 11.8.2, 11.7.x \u003c= 11.7.6, 10.11.x \u003c= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697","status":"published","published":"2026-08-17T15:30:40Z","modified":"2026-08-17T15:30:44Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:10:34.652326Z"}],"nvd":[{"id":"CVE-2026-16048","description":"Mattermost versions 11.8.x \u003c= 11.8.2, 11.7.x \u003c= 11.7.6, 10.11.x \u003c= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697","status":"published","published":"2026-08-17T15:16:54.31Z","modified":"2026-08-18T20:42:05.627Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:12:38.647684Z"}],"osv":[{"id":"CVE-2026-16048","title":"Channel member roles accept out-of-scope roles","description":"Mattermost versions 11.8.x \u003c= 11.8.2, 11.7.x \u003c= 11.7.6, 10.11.x \u003c= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697","status":"published","published":"2026-08-17T14:22:43.94Z","modified":"2026-10-28T02:30:29.558778385Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:44:57.682091Z"}]}}