IBM CICS TX Advanced is a transaction processing monitoring system from International Business Machines (IBM) for running large-scale, high-transaction-volume applications in enterprise environments. A cross-site scripting vulnerability exists in IBM CICS TX Advanced version 10.1, which stems from the application’s lack of effective filtering and escaping of user-supplied data, and can be exploited by an attacker to execute arbitrary Web script or HTML by injecting a crafted payload.