The HttpClusterServlet and HttpProxyServlet in BEA WebLogic Express and WebLogic Server 6.1 through SP7, 7.0 through SP7, 8.1 through SP5, 9.0, and 9.1, when SecureProxy is enabled, may process "external requests on behalf of a system identity," which allows remote attackers to access administrative data or functionality.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34282
http://www.vupen.com/english/advisories/2008/0612/references
http://www.vupen.com/english/advisories/2007/1815
http://securitytracker.com/id?1018057
http://secunia.com/advisories/29041
http://secunia.com/advisories/25284