Mac users, make sure you get the latest security patch from Apple. It covers some distinct vulnerabilities in terms of wireless networking, as well as patching several dozen general system and application vulnerabilities. You can read more about it here.
To get it, just click the Apple icon in the upper-left corner of the screen and then choose ‘Software Update’ from the menu that comes down. While being on a Mac does make you safer, it certainly does not make you invulnerable.