{"id":"CVE-2025-27715","aliases":["BIT-mattermost-2025-27715","GHSA-cw7q-5cgc-h3h9","GO-2025-3555"],"url":"https://o3.security/vulnerability/CVE-2025-27715","summary":"Auto-Enrollment of Team Admins into Private Channels without explicit consent","details":"Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.","published":"2025-03-21T08:22:25.321Z","modified":"2026-07-15T01:49:08.474789994Z","cvss":{"score":3.3,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","fixedVersion":"9.11.9"}],"fix":null,"references":[{"type":"WEB","url":"https://mattermost.com/security-updates"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27715.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27715"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:08.474789994Z"}}