Cross-site scripting (XSS) vulnerability in index.php in common solutions csphonebook 1.02 allows remote attackers to inject arbitrary web script or HTML via the letter parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44180
http://www.securityfocus.com/archive/1/496788/100/0/threaded
http://www.securityfocus.com/archive/1/494971/100/0/threaded