Cross-site scripting (XSS) vulnerability in the Rendezvous Daemon (rvd), Rendezvous Routing Daemon (rvrd), Rendezvous Secure Daemon (rvsd), and Rendezvous Secure Routing Daemon (rvsrd) in TIBCO Rendezvous before 8.4.2, Messaging Appliance before 8.7.1, and Substation ES before 2.8.1 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.