Multiple directory traversal vulnerabilities in Apache Struts 2.0.x before 2.0.12 and 2.1.x before 2.1.3 allow remote attackers to read arbitrary files via a ..%252f (encoded dot dot slash) in a URI with a /struts/ path, related to (1) FilterDispatcher in 2.0.x and (2) DefaultStaticContentLoader in 2.1.x.
http://www.vupen.com/english/advisories/2008/3003
http://www.securityfocus.com/bid/32104
http://struts.apache.org/2.x/docs/s2-004.html