On Monday March 5th, Apple released 8 security patches for both the Windows and Mac versions of Quicktime. Quicktime is an Apple media player application that is bundled with iTunes.
Without the patches, Mac's and Windows PC's are vulnerable to a cyberattack. A malicious file can be created that when opened with Quicktime, could give the attacker full control over a computer.
If you have Quicktime installed, click here and download the latest updates for your operating system.