PHP file inclusion vulnerability in php121db.php in PHP121 Instant Messenger 2.2 allows remote attackers to execute arbitrary PHP code via a UNC share pathname or a local file pathname in the php121dir parameter, which is accessed by the file_exists function.
https://www.exploit-db.com/exploits/3694
https://exchange.xforce.ibmcloud.com/vulnerabilities/33525
http://www.vupen.com/english/advisories/2007/1314
http://www.securityfocus.com/bid/23392