Cross-site scripting (XSS) vulnerability in FlatNuke 2.5.3 allows remote attackers to inject arbitrary web script or HTML via the border or back parameters to (1) help.php or (2) footer.php.
http://www.vupen.com/english/advisories/2005/0697
http://secwatch.org/advisories/secwatch/20050604_flatnuke.txt
http://securitytracker.com/id?1014114
http://secunia.com/advisories/15603
http://flatnuke.sourceforge.net/index.php?mod=read&id=1117979256