JBoss RichFaces before 4.5.4 allows remote attackers to inject expression language (EL) expressions and execute arbitrary Java code via the do parameter.
https://bugzilla.redhat.com/show_bug.cgi?id=1192140
http://seclists.org/fulldisclosure/2020/Mar/21
http://seclists.org/fulldisclosure/2019/Jul/21
http://packetstormsecurity.com/files/156663/Richsploit-RichFaces-Exploitation-Toolkit.html
http://packetstormsecurity.com/files/153734/Tufin-Secure-Change-Remote-Code-Execution.html