The Wii U Web Browser Exploit has been leaked. It only works for those on firmware 4.1.0. It was reported that it would also work for 4.0 and 4.03, but it’s unconfirmed at the moment. This exploit was partially blocked in update 5.0. Developers will have to find different ways to attack the exploit, in order for this to work in newer firmwares. This is only a partial exploit.
Here it is wiiubrowserexploit.rar