WebAccess in VMware VirtualCenter 2.0.2 and 2.5, VMware Server 2.0, and VMware ESX 3.0.3 and 3.5 allows remote attackers to leverage proxy-server functionality to spoof the origin of requests via unspecified vectors, related to a "URL forwarding vulnerability."
http://www.vmware.com/security/advisories/VMSA-2010-0005.html
http://www.securitytracker.com/id?1023769
http://www.securityfocus.com/bid/39037
http://lists.vmware.com/pipermail/security-announce/2010/000086.html