Apparently every console has access to the admin interface of the online component. One user accessed it by mistake.
Nintendo's WiiU "hacked" day one
neogaf.com
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Nintendo's WiiU "hacked" day one
neogaf.com
He didn't "hack" anything (he just happened to press 'x' while hovering over the exit button), and it wasn't hacking the Wii itself in any sense that you might refer to the hacking of a console.