Hyundai
Not if you take them (there are two security workers behind this) at their word:
In the past few years, we'd found ways to remotely control vehicles from Honda, Acura, Nissan, Infiniti, Hyundai, Genesis, Ford, Porsche, Kia, and Subaru, but we'd never found a vulnerability that enabled remote access to either an Automaker #1 or Automaker #2 vehicle.
Combined with the "across both of their brands" comment, and we're restricted to cars available new in Australia in 2023, I'm guessing Toyota/Lexus. Could be Land Rover/Jaguar too.
Why would they be so circumspect? Presumably the automaker has fixed this by now.
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The color scheme on the admin panel suggests Toyota.