BEA WebLogic Server 8.1 through 8.1 SP5, 9.0, 9.1, and 9.2 Gold, when WS-Security is used, does not properly validate certificates, which allows remote attackers to conduct a man-in-the-middle (MITM) attack.
http://www.vupen.com/english/advisories/2007/0213
http://www.securityfocus.com/bid/22082
http://securitytracker.com/id?1017525