Cross-site scripting (XSS) vulnerability in guestbook.php in phpBook 1.46 allows remote attackers to inject arbitrary web script or HTML via the admin parameter.
Direct static code injection vulnerability in phpBook 1.3.2 and earlier allows remote attackers to execute arbitrary PHP code via the e-mail field (mail variable) in a new message, which is written to a PHP file.
phpBook 2.1.0 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by doc/updatesmilies1.50-1.60.php and certain other files.