"Adobe has released security updates for Adobe Flash Player...[that] address vulnerabilities that could cause a crash and potentially allow an attacker to take control of the affected system."
-Adobe Security Bulletin
This security flaw is "being exploited in the wild in targeted attacks designed to trick the user into opening a Microsoft Word document delivered as an email attachment which contains malicious Flash (SWF) content."
Affected software versions
- Adobe Flash Player 11.5.502.146 and earlier versions for Windows and Macintosh
- Adobe Flash Player 188.8.131.521 and earlier versions for Linux
- Adobe Flash Player 184.108.40.206 and earlier versions for Android 4.x
- Adobe Flash Player 220.127.116.11 and earlier versions for Android 3.x and 2.x
To verify the version of Adobe Flash Player installed on your system, access the About Flash Player page, or right-click on content running in Flash Player and select "About Adobe (or Macromedia) Flash Player" from the menu. If you use multiple browsers, perform the check for each browser you have installed on your system.
To verify the version of Adobe Flash Player for Android, go to Settings > Applications > Manage Applications > Adobe Flash Player x.x.
Keep your software updated :)