The next cumulative update is available. It needs to install SP1 before you install post SP1 updates. See also http://blogs.technet.com/b/stefan_gossner/archive/2012/07/11/is-sp1-installed-on-your-sharepoint-2010-farm.aspx

MSF2010:
2794728 The full server package for Microsoft SharePoint Foundation 2010
http://support.microsoft.com/default.aspx?scid=kb;EN-US;2794728

Download link: http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2794728&kbln=en-us

SPS2010:
2775353 The full server package for SharePoint Server 2010 and contains also the MSF2010 fixes so you need only this one package.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;2775353

Download link: http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2775353&kbln=en-us

Important for all Server Applications listed above:
After applying the preceding updates, run the SharePoint Products and Technologies Configuration Wizard or “psconfig –cmd upgrade –inplace b2b -wait” in command line. This needs to be done on all servers in the farm with SharePoint installed. You can run psconfig in parallel on all SharePoint machines.

SP1 references:

Posts by CAPES:
SharePoint 2010 SP1 and the June Cumulative Update for SharePoint 2010

Office 2010 Service Pack 1 - 5 Common questions regarding the Service Pack

Similar post from my colleague Stefan Gossnner: http://blogs.technet.com/b/stefan_gossner/archive/2013/04/10/april-2013-cu-for-sharepoint-2010-has-been-released.aspx