Freescripts » Visitorbook : Security Vulnerabilities, CVEs,

Cross-site scripting (XSS) vulnerability in FreeScripts VisitorBook LE (visitorbook.pl) allows remote attackers to inject arbitrary HTML or web script via (1) the "do" parameter, (2) via the "user" parameter from a host with a malicious reverse DNS name, (3) via quote marks or ampersands in other parameters.

FreeScripts VisitorBook LE (visitorbook.pl) does not properly escape line breaks in input, which allows remote attackers to (1) use VisitorBook as an open mail relay, when $mailuser is 1, via extra headers in the email field, or (2) cause the guestbook database to be deleted via a large number of line breaks that exceeds the $max_posts variable.