…and the list is surprisingly long. Six for device redirection, seven for authentication, seven as “core” updates, four for RemoteApps, three for RD Gateway and RD Web, and three more for Session broker.
Find the links here: http://support.microsoft.com/kb/2312539
You might have missed this update, as it was a “Fast Publish” TechNet article released about a month ago. If you’re running either RDS or XenApp, check out the link above and see if any problems you’re experiencing might be fixed with a hotfix.