{"id":"CVE-2026-27769","aliases":["GHSA-mxxh-fmjq-j6x4","GO-2026-5522"],"url":"https://o3.security/vulnerability/CVE-2026-27769","summary":"Connected Workspaces: Malicious remote server can manipulate arbitrary user's status","details":"Mattermost versions 10.11.x <= 10.11.12 fail to validate whether users were correctly owned by the correct Connected Workspace which allows a malicious remote server connected using the Conntexted Workspaces feature to change the displayed status of local users via the Connected Workspaces API.. Mattermost Advisory ID: MMSA-2026-00603","published":"2026-04-15T10:11:07.676Z","modified":"2026-08-12T03:51:17.334963221Z","cvss":{"score":2.7,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N"},"epss":{"score":0.00167,"percentile":0.06218,"asOf":"2026-08-30"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","fixedVersion":"8.0.0-20260316060126-bc1a2b34b1f9"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27769.json"},{"type":"ADVISORY","url":"https://mattermost.com/security-updates"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27769"},{"type":"PACKAGE","url":"https://github.com/mattermost/mattermost"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:17.334963221Z"}}