The JMS Message Bridge in BEA WebLogic Server 7.0 through SP7 and 8.1 through Service Pack 6, when configured without a username and password, or when the connection URL is not defined, allows remote attackers to bypass the security access policy and "send unauthorized messages to a protected queue."
https://exchange.xforce.ibmcloud.com/vulnerabilities/34287
http://www.vupen.com/english/advisories/2007/1815
http://securitytracker.com/id?1018057