Nimey writes: Adobe has posted a security bulletin for Photoshop CS5 for Windows and OSX. It seems there is a critical security hole that will allow attackers to execute arbitrary code in the context of the user running the affected application. Adobe's fix? You need to pay to upgrade to Photoshop CS6. For users who cannot upgrade to Adobe Photoshop CS6, Adobe recommends users follow security best practices and exercise caution when opening files from unknown or untrusted sources.