SQL Server 2012 SP1 CU4 was released on May 31, 2013
SQL Server 2012 SP1 CU4 was released on May 31, 2013. You can get more information from the KB listed below.
2839806 Cumulative update package 4 for SQL Server 2012 SP1
At mean time, the following SQL Server 2012 hotfix got released
2840614 FIX: Master Data Explorer pane does not display in the SQL Server 2012 MDS Add-in for Excel
2840658 FIX: "You have requested to validate more than 10000 members" error when you validate entities in Excel
For more information on SQL CU version, please refer to the following link: