An improper authorization vulnerability exists in Jenkins vSphere Plugin 2.16 and older in Clone.java, CloudSelectorParameter.java, ConvertToTemplate.java, ConvertToVm.java, Delete.java, DeleteSnapshot.java, Deploy.java, ExposeGuestInfo.java, FolderVSphereCloudProperty.java, PowerOff.java, PowerOn.java, Reconfigure.java, Rename.java, RenameSnapshot.java, RevertToSnapshot.java, SuspendVm.java, TakeSnapshot.java, VSphereBuildStepContainer.java, vSphereCloudProvisionedSlave.java, vSphereCloudSlave.java, vSphereCloudSlaveTemplate.java, VSphereConnectionConfig.java, vSphereStep.java that allows attackers to perform form validation related actions, including sending numerous requests to the configured vSphere server, potentially resulting in denial of service, or send credentials stored in Jenkins with known ID to an attacker-specified server ('test connection').