WordPress 3.3.2 and 3.4 Beta 3 have been released. This important security update plugs exploits in Plupload, SWFUpload, and SWFObject (three external libraries used by WordPress), as well as a few additional fixes.
WordPress 3.4 Beta 3 is still not ready for prime time, but provides almost 90 fixes since the second beta release. Please do take a few swings at it on a test installation, especially if you are a plugin or theme developer. If you find any bugs, please report them, and contact the support forums if you need any help.
If you’re currently running on the WordPress 3.3 branch, please update to 3.3.2 as soon as you can!