This indicates an attack attempt to exploit a Code Execution vulnerability in Oracle WebLogic Server.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the wls-wsat component, when handling a maliciously crafted HTTP request. A remote attacker may be able exploit this to execute arbitrary code within the context of the application via a crafted request.
Oracle Weblogic Server 10.3.6 0
Oracle Weblogic Server 22.214.171.124
Oracle Weblogic Server 126.96.36.199
Oracle Weblogic Server 188.8.131.52
System Compromise: Remote attackers can gain control of vulnerable systems
Apply the most recent upgrade or patch from the vendor.