Researchers have been working with Google Wallet, and yesterday they outlined a complex way to crack Wallet's PIN. This leaves the funds connected to the number vulnerable to theft. The researchers report that the hack job doesn't require any special tools or software or even any special skill for that matter.
The method requires only that a user clear the data for the Google Wallet app in the phone's applications settings menu and then enter a new pin when prompted to do so. This is the second security problem that has been reported with Google Wallet. Users might want to think twice about keeping this thing around.
Update: Google responds.