Incomplete blacklist vulnerability in main.php in phPay 2.02.01 on Windows allows remote attackers to conduct directory traversal attacks and include and execute arbitrary local files via a ..\ (dot dot backslash) in the config parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/39063
http://www.vupen.com/english/advisories/2007/4231
http://www.securityfocus.com/archive/1/485149/100/0/threaded