The product group released the April 2013 Cumulative Update for the SharePoint 2013 product family.
The Full Server Packages for April 2013 CU are available through the following links:
- Download SharePoint Foundation 2013 April 2013 CU
- Download SharePoint Server 2013 April 2013 CU
- Download Project Server 2013 April 2013 CU
- Download Office Web Apps Server 2013 April 2013 CU
After installing the fixes you need to run the SharePoint 2013 Products Configuration Wizard on each machine in the farm.
** The SharePoint Server 2013 CU contains the SharePoint Foundation CU. And the SharePoint Server 2013 with Project Server CU contains Project Server CU, SharePoint Server CU and SharePoint Foundation CU.
That means only one package has to be installed for the SharePoint 2013 product family **