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.
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.