Earlier this morning Apple admitted some staff Macs were hacked by the same group that targeted Facebook last week. Apple noted the bug was related to a Java exploit and said an update was coming today. That software update has now gone live via Software Update and it addresses the following:
This release updates the Apple-provided system Java SE 6 to version 1.6.0_41 and is for OS X versions 10.7 or later.
This update uninstalls the Apple-provided Java applet plug-in from all web browsers. To use applets on a webpage, click on the region labeled “Missing plug-in” to go download the latest version of the Java applet plug-in from Oracle.
This update also removes the Java Preferences application, which is no longer required to configure applet settings.
You can get the update by going to Apple > Software Update on your Mac.