It was done via webkit, which Nintendo full well knows is a a vulnerable piece of shit and more than likely accounted for webkit being exploitable. Talented hackers probing at the console have said the baseline security of the system is much better, making any kind of kernel level exploit difficult if not practically impossible to achieve. The hardware is resistant to methods like voltage glitching.

Not to say something won't be found but it could be a long time for something useful to be discovered.