Multiple cross-site scripting (XSS) vulnerabilities in XWork in Apache Struts 2.x before 2.2.3, and OpenSymphony XWork in OpenSymphony WebWork, allow remote attackers to inject arbitrary web script or HTML via vectors involving (1) an action name, (2) the action attribute of an s:submit element, or (3) the method attribute of an s:submit element.
https://issues.apache.org/jira/browse/WW-3579
http://www.vupen.com/english/advisories/2011/1198
http://struts.apache.org/2.2.3/docs/version-notes-223.html
http://secureappdev.blogspot.com/2011/05/Struts_2_XWork_WebWork_XSS_in_error_pages.html