Following the earlier leak, an official release has been posted with more info on its proper usage.
This release contains a way to run code inside the Wii U's web browser. It provides a means to execute arbitrary code in the Cafe OS userspace on the Espresso processor.
A few days ago, unofficial files for 'browser exploit' on the Wi U was getting passed around, and MaxConsole got a copy of it via random-generated email and we decided to post it as news, and this started alot of 'scene drama' as usual, but now an official release has been posted up on BitBucket with a complete 'readme' on what it is and how it works and what you can and can not do with it on your v4.1.0 Nintendo Wii U console.
NEWS SOURCE: Wii U UserSpace (via) BitBucket