Multiple directory traversal vulnerabilities in Really Simple PHP and Ajax (RSPA) 2007-03-23 allow remote attackers to include and execute arbitrary local files via a .. (dot dot) in the __class parameter to (1) Controller_v4.php or (2) Controller_v5.php.
https://www.exploit-db.com/exploits/3641
https://exchange.xforce.ibmcloud.com/vulnerabilities/33357
http://www.vupen.com/english/advisories/2007/1190
http://www.bugtraq.ir/articles/advisory/RSPA_File_Inclusion/6