Cross-site scripting (XSS) vulnerability in guestbook.js.php in MJGuest 6.8 GT allows remote attackers to inject arbitrary web script or HTML via the link parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44139
http://www.securityfocus.com/bid/30438
http://www.securityfocus.com/archive/1/497750/100/0/threaded
http://www.mdsjack.bo.it/files/mjguest.log.txt