If you use a Mac, and you have a Skype account, you could be at risk. A previously undiscovered backdoor was recently found by researchers at SpiderLabs that would allow any moderately skilled hacker to take control of the app and use it to gain access to a variety of information, including:
• Any contact information the user has entered into Skype
• Call audio
• Chat sessions
• Incoming messages
All it takes is for the hacker to change the contents of a single line of code in the “Skype Dashbd Wdgt Plugin,” and they can gain control.