While we recommend connecting your JuiceBox to WiFi so you can fully utilize the devices Smart Charging features, we do not store network credentials and we cannot see your network password. The network credentials are stored locally on the JuiceBox and the communication is encrypted, it is no different from adding a printer, a thermostat, or a wireless camera to your WiFi network.
There are no security vulnerabilities and access to the JuiceBox is only possible within the 3-6 minute setup time. After the initial setup, the JuiceBox will not respond to pings and cannot be accessed unless rebooted. The JuiceBox does not require a WiFi connection to charge a vehicle.