Cross-site scripting vulnerability in eintrag.php in Gästebuch (Gastebuch) before 1.3.3 allows remote attackers to inject arbitrary web script or HTML via the URL, which is used in the homepage parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24670
http://www.vupen.com/english/advisories/2006/0566
http://www.php4scripte.de/index.php