Ghost in the Drone: Unauthenticated Shell Access in PX4 Autopilot’s 9.8 CVSS Nightmare Vulnerability Report Ghost in the Drone: Unauthenticated Shell Access in PX4 Autopilot’s 9.8 CVSS Nightmare Do Son April 1, 2026 0 PX4 Autopilot faces a critical 9.8 CVSS flaw (CVE-2026-1579). Unsigned MAVLink messages allow remote shell access. Enable message signing now to secure your fleet.