shared/code/tce_tmx.php in TCExam 4.0.011 and earlier allows remote attackers to create arbitrary PHP files in cache/ by placing file contents and directory traversal manipulations into a SessionUserLang cookie to public/code/index.php.
https://www.exploit-db.com/exploits/3816
https://exchange.xforce.ibmcloud.com/vulnerabilities/33958
http://www.vupen.com/english/advisories/2007/1583
http://www.securityfocus.com/bid/23705
http://www.attrition.org/pipermail/vim/2007-May/001571.html