Edit: Update Rollup 18 is now available for Exchange 2010 SP3 see the post Exchange 2010 SP3 Update Rollup 18 installation tips.
Microsoft have just released the latest round of Update Rollups for Exchange 2007 and 2010.
Note: at the same time Microsoft released MS13-061 for Exchange 2013 CU1 and CU2, but at the time of writing have removed them from the download site due to issues with the installation process.
I’ll be testing the UR install process in the next few days, so you may want to wait while before rolling them out in your production environments, or test them first yourself.
You can find the official Exchange Team blog post here.