http://www.slashgear.com/samsung-galaxy-s-iii-remote-data-wipe-hack-discovered-25249061/
Article says it all basically. A simple bit of javascript code will irrecoverably wipe a Galaxy S3 handset when the page is loaded. Apparently it is based upon using javascript to let the dialer enter a factory reset code. When telling it to dial a number it will ask you if you really want to dial it, but somehow the dialer goes straight to wipe mode as soon as the last digit of the code is entered, and behaves likewise when that code is fed to it via javascript.
Article says it all basically. A simple bit of javascript code will irrecoverably wipe a Galaxy S3 handset when the page is loaded. Apparently it is based upon using javascript to let the dialer enter a factory reset code. When telling it to dial a number it will ask you if you really want to dial it, but somehow the dialer goes straight to wipe mode as soon as the last digit of the code is entered, and behaves likewise when that code is fed to it via javascript.