VMware VirtualCenter 2.5 before Update 2 and 2.0.2 before Update 5 relies on client-side "enabled/disabled functionality" for access control, which allows remote attackers to determine valid user names by enabling functionality in the GUI and then making an "attempt to assign permissions to other system users."
Exposure of Sensitive Information to an Unauthorized Actor The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.