GHSA-2rc4-7jc6-qffh: Fleet has a Windows MDM management endpoint authentication bypass

Fleet, a device management system, had a security flaw in its Windows MDM (mobile device management, a system for controlling and configuring devices) endpoint where requests without proper client certificates (digital credentials proving a device's identity) were incorrectly accepted as trusted. An attacker who knew a valid device's identifier could impersonate that device and receive sensitive configuration data like Wi-Fi passwords or VPN settings intended for the real device.