OWASP Stinger before 2.5 allows remote attackers to bypass input validation routines by using multipart encoded requests instead of form-urlencoded requests. NOTE: this might be used to expose vulnerabilities in applications that would otherwise be protected by the validation routines.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35981
http://www.securitytracker.com/id?1018555
http://www.securityfocus.com/archive/1/476288/100/0/threaded
http://securityreason.com/securityalert/3035
http://secunia.com/advisories/26441
http://o0o.nu/~meder/o0o_bypassing_servlet_input_validation_filters.txt