https://www.bleepingcomputer.com/news/security/hyundai-app-bugs-allowed-hackers-to-remotely-unlock-start-cars/

Vulnerabilities in mobile apps exposed Hyundai and Genesis car models after 2012 to remote attacks that allowed unlocking and even starting the vehicles.

Security researchers at Yuga Labs found the issues and explored similar attack surfaces in the SiriusXM "smart vehicle" platform used in cars from other makers (Toyota, Honda, FCA, Nissan, Acura, and Infinity) that allowed them to "remotely unlock, start, locate, flash, and honk" them.