Multiple cross-site scripting (XSS) vulnerabilities in the guestbook in SineCMS 2.3.4 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) username (user) or (2) comment (commento) field, different vectors than CVE-2007-2357.
https://www.exploit-db.com/exploits/4693
https://exchange.xforce.ibmcloud.com/vulnerabilities/38893
http://www.securityfocus.com/archive/1/485267/100/200/threaded
http://www.securityfocus.com/archive/1/484648/100/0/threaded