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EUVD-2026-290203

fkie_cve-2026-27806

Fleet is open source device management software. Prior to 4.81.1, the 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. This vulnerability is fixed in 4.81.1.

GHSA-rphv-h674-5hp2 — Fleet Affected by Local Privilege Escalation via Tcl Command Injection in Orbit

Affected: Go: github.com/fleetdm/fleet/v4

## Summary

The 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.

## CWE

- **CWE-78**: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') - **CWE-94**: Improper Control of Generation of Code ('Code Injection')

## Impact

- Local privilege escalation to root: Any unprivileged local user on a managed endpoint can execute arbitrary commands as root

## Credit

This vulnerability was discovered and reported by [bugbunny.ai](https://bugbunny.ai).

WID-SEC-W-2026-1015 — Fleet: Schwachstelle ermöglicht Privilegieneskalation

Ein lokaler Angreifer kann eine Schwachstelle in Fleet ausnutzen, um seine Privilegien zu erhöhen.