Security hole left Samsung Account data vulnerable - update your account
So far only the Galaxy S 4 and the Galaxy Tab 3 are confirmed to have had the vulnerability. It’s possible more devices are affected.
What would happen is during the Samsung account creation process, the devices in question would transmit your personal data (name, e-mail address, and password) in an insecure fashion, making it possible for anyone on the same Wi-Fi network as you to swipe your info.
It doesn’t sound like much, but as you may already know, your Samsung account provides for a method to remotely control your device and track down its location. Anyone with your Samsung account information would then, in turn, be able to track you and control your device. Not good.
Supposedly Samsung has already fixed the issue and there’s nothing left to worry about, but it’s recommended you take the time and change your account password. You can do so by visiting this page on Samsung’s site.