Critical vulnerabilities have been identified in Photoshop CS4 that could allow an attacker who successfully exploits these vulnerabilities to take control of the affected system. A malicious .TIFF file must be opened in Photoshop CS4 by the user for an attacker to exploit these vulnerabilities. Adobe recommends Photoshop CS4 customers update to Photoshop CS4 11.0.1, which resolves these issues.

Note: These issues do not affect Photoshop CS5.

See Adobe Security Bulletin