Direct static code injection vulnerability in HIOX Guest Book (HGB) 4.0 allows remote attackers to inject arbitrary PHP code via the Email field, which results in code execution through a direct request to gb.php.

Cross-site scripting (XSS) vulnerability in index.php in Hiox Guestbook 3.1 allows remote attackers to inject arbitrary web script or HTML via the input forms for signing the guestbook.