Adobe has announced a security update for CS5 and CS 5.1 for both Mac and Windows.
This update addresses vulnerabilities that could allow an attacker to take control of the affected system. For an attacker to exploit these vulnerabilities, a user must open a malicious TIF or DAE file in Photoshop CS5.1, Photoshop CS5, and earlier. Adobe is not aware of any attacks exploiting these vulnerabilities against Adobe Photoshop.
The update is available at the following location.