SQL injection vulnerability in index.php in ClientExec 2.3 allows remote attackers to execute arbitrary SQL commands via the (1) billshowid, (2) billdetailid, (3) fuse, and (4) frmClientID parameters.
https://exchange.xforce.ibmcloud.com/vulnerabilities/23271
http://www.vupen.com/english/advisories/2005/2628
http://www.clientexec.com/forum/showthread.php?t=8006
http://www.ce-talk.com/showthread.php?t=653
http://pridels0.blogspot.com/2005/11/clientexec-2x-multiple-sql-inj.html