Apache Struts before 2.3.1.2 allows remote attackers to bypass security protections in the ParameterInterceptor class and execute arbitrary commands.
https://security-tracker.debian.org/tracker/CVE-2011-3923
https://exchange.xforce.ibmcloud.com/vulnerabilities/72585
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-3923
http://www.securitytracker.com/id?1026575
http://www.securityfocus.com/bid/51628