{"id":"CVE-2026-27806","aliases":["GHSA-rphv-h674-5hp2","GO-2026-5634"],"url":"https://o3.security/vulnerability/CVE-2026-27806","summary":"Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit","details":"## Summary\n\nThe Orbit agent's FileVault disk encryption key rotation flow on collects a local user's password via a GUI dialog and interpolates it directly into a Tcl/expect script executed via `exec.Command(\"expect\", \"-c\", script)`. Because the password is inserted into Tcl brace-quoted `send {%s}`, a password containing `}` terminates the literal and injects arbitrary Tcl commands. Since Orbit runs as root, this allows a local unprivileged user to escalate to root privileges.\n\n## CWE\n\n- **CWE-78**: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')\n- **CWE-94**: Improper Control of Generation of Code ('Code Injection')\n\n## Impact\n\n- Local privilege escalation to root: Any unprivileged local user on a managed endpoint can execute arbitrary commands as root\n\n## Credit\n\nThis vulnerability was discovered and reported by [bugbunny.ai](https://bugbunny.ai).","published":"2026-04-08T17:40:24.119Z","modified":"2026-08-12T03:51:31.105171104Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.00111,"percentile":0.01529,"asOf":"2026-08-04"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","fixedVersion":"4.81.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27806.json"},{"type":"ADVISORY","url":"https://github.com/fleetdm/fleet/security/advisories/GHSA-rphv-h674-5hp2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27806"},{"type":"PACKAGE","url":"https://github.com/fleetdm/fleet"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:31.105171104Z"}}