Toyota has warned that the personal information of roughly 300,000 customers may have been exposed. The possible exposure relates to T-Connect, an official Toyota app that allows customers to connect their smartphone to their vehicle's dashboard infotainment system. A subcontractor developing the site inadvertently uploaded part of the site’s source code to a public GitHub repository in December 2017. This source code contained an access key to a server that stored customer email addresses and customer management numbers.