Cross-site scripting (XSS) vulnerability in admin_login.php in MCshoutbox 1.1 allows remote attackers to inject arbitrary web script or HTML via the loginerror parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/51862
http://www.vupen.com/english/advisories/2009/1961
http://www.exploit-db.com/exploits/9205