Guillaume Teissier reported that the XMLRPC client in libxmlrpc3-java, an XML-RPC implementation in Java, does perform deserialization of the server-side exception serialized in the faultCause attribute of XMLRPC error response messages. A malicious XMLRPC server can take advantage of this flaw to execute arbitrary code with the privileges of an application using the Apache XMLRPC client library. Note that a client that expects to get server-side exceptions need to set explicitly the enabledForExceptions property.