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Connected cars can be hacked, research finds
(news.northeastern.edu)
This is a most excellent place for technology news and articles.
I think many vehicles still use the old CAN bus that just wasn't setup with external connectivity in mind. It's well known that even premium brands often reuse all the same components.
I've heard that Tesla were the first to replace this with something closer to a modern network in the cybertruck, of all things.