The CU provides the following fixes and improvements (Referenced from https://support.microsoft.com/en-us/help/4018397/may-8-2018-cumulative-update-for-sharepoint-enterprise-server-2013)

  • Allows cloud hybrid search in SharePoint 2013

The CU also installs the following security updates

  • Security update for SharePoint Foundation 2013: May 8, 2018 (KB4018398)
  • Security update for SharePoint Server 2013: May 8, 2018 (KB4018390)
  • Security update for SharePoint Server 2013: May 8, 2018 (KB4018388)

You can download this CU from http://www.microsoft.com/downloads/details.aspx?familyid=5d14f070-0eef-49fd-9a66-6672e99e795a

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