A certain admin script in Inout Meta Search Engine sends a redirect to the web browser but does not exit when administrative credentials are missing, which allows remote attackers to inject arbitrary PHP code, as demonstrated by a request to admin/create_engine.php followed by a request to admin/generate_tabs.php.
https://www.exploit-db.com/exploits/4004
https://exchange.xforce.ibmcloud.com/vulnerabilities/34563
http://www.securityfocus.com/bid/24199
http://www.securityfocus.com/bid/24189
http://www.securityfocus.com/archive/1/469808/100/0/threaded