SQL injection vulnerability in php121language.php in PHP121 1.4 allows remote attackers to execute arbitrary SQL commands and execute arbitrary code via the sess_username variable, as set by the php121un HTTP COOKIE parameter, which is used in multiple files including php121login.php. NOTE: the code execution occurs because the SQL query results are used in an include statement.
https://www.exploit-db.com/exploits/1666
https://exchange.xforce.ibmcloud.com/vulnerabilities/25785
http://www.vupen.com/english/advisories/2006/1349
http://www.securityfocus.com/bid/17509
http://securitytracker.com/id?1015936