The Single Sign-On feature in VMware vCenter Server 5.5 before U3e and 6.0 before U2a and vRealize Automation 6.x before 6.2.5 allows remote attackers to read arbitrary files or cause a denial of service via an XML document containing an external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue.
http://www.vmware.com/security/advisories/VMSA-2016-0022.html
http://www.securitytracker.com/id/1037329