The ParametersInterceptor in Apache Struts before 2.3.16.2 allows remote attackers to "manipulate" the ClassLoader via the class parameter, which is passed to the getClass method.
http://www.vmware.com/security/advisories/VMSA-2014-0007.html
http://www.securitytracker.com/id/1029876
http://www.securityfocus.com/bid/65999
http://www.securityfocus.com/archive/1/532549/100/0/threaded
http://www.securityfocus.com/archive/1/531362/100/0/threaded
http://www.oracle.com/technetwork/topics/security/cpuapr2015-2365600.html
http://www.konakart.com/downloads/ver-7-3-0-0-whats-new
http://www.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-350733.htm
http://www-01.ibm.com/support/docview.wss?uid=swg21676706
http://struts.apache.org/release/2.3.x/docs/s2-020.html
http://secunia.com/advisories/59178
http://secunia.com/advisories/56440
http://packetstormsecurity.com/files/127215/VMware-Security-Advisory-2014-0007.html