Apple used its built-in malware protection system to disable Adobe Flash version 11.8.800.94 and earlier on Macs on Tuesday over security concerns. The lockdown means that only the most recent version of Flash, 11.8.800.168, will run on OS X Snow Leopard, Lion, and Mountain Lion.
Apple disabled Adobe's Flash on OS X over security threats
The security vulnerabilities could allow attackers to take control over victim's systems and run malicious code.
You can check your Flash Player version in System Preferences
If Flash is installed on your Mac you can check to see which version you're running by launching System Preferences, selecting the Flash Preference Pane, and then choosing the Advanced tab. You can also update to the latest version of Flash from there, or go to the Adobe Flash Player website to download the installer.