Unspecified vulnerability in IBM WebSphere Application Server before 6.0.2.11 has unknown impact and attack vectors because the "UserNameToken cache was improperly used."
http://www.vupen.com/english/advisories/2006/2482
http://www.securityfocus.com/bid/18578
http://www-1.ibm.com/support/docview.wss?rs=180&uid=swg27006876