Adobe released a security update for Adobe Photoshop CS5 and Adobe Photoshop CS5.1 for Windows and Mac OS. This update addresses vulnerabilities that could allow an attacker who successfully exploits these vulnerabilities to take control of the affected system. The affected versions are Photoshop CS5 and CS5.1 for Windows and Mac OS.
You will not need this update if you have already upgraded to version CS6. You cxan read about the update and download it at Adobe's website here.