Apache Struts 2 is a sophisticated, extensible platform for developing enterprise-grade Java web applications. There is a remote code execution vulnerability in Apache Struts S2-032. This vulnerability exists when Dynamic Method Invocation (DMI) is enabled. Because expressions passed to the server side are not adequately validated using the method: prefix.
If Direct Method Invocation (DMI) is enabled, disable it.
Update your Apache Struts Server, to the latest version to eliminate this vulnerability.