This indicates an attack attempt to exploit a Cross Site Scripting vulnerability in IBM WebSphere Application Server.
The vulnerability is a result of the application's failure to sanitize inputs from users. It may allow a remote attacker to execute arbitrary script code within the context of the application.
IBM WebSphere Application Server 6.1.0 and earlier versions.
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.