https://www.wired.com/story/tesla-model-x-hack-bluetooth/

Tesla has always prided itself on its so-called over-the-air updates, pushing out new code automatically to fix bugs and add features. But one security researcher has shown how vulnerabilities in the Tesla Model X's keyless entry system allow a different sort of update: A hacker could rewrite the firmware of a key fob via Bluetooth connection, lift an unlock code from the fob, and use it to steal a Model X in just a matter of minutes.

"Basically a combination of two vulnerabilities allows a hacker to steal a Model X in a few minutes time," says Wouters

This news puts Tesla users in real danger, until Tesla solves the issue all Tesla users should be very cautious when using Bluetooth out in the open, as being prone to any form of a cyber attack (especially in a fully automated car) is extremely dangerous.