Gordon Maddern, a security expert at Pure Hacking company, indicated that “the attacker only needs to send a message to the victim to take control of the Mac, it is extremely dangerous.” This issue does not affect users of Skype 5 for Windows and Linux.
Since Skype have indicated that said vulnerability is exclusive to the Skype version 5 and it does not affect previous versions.
At the same time they have published an update, which you can access for free from the Skype website.
