PHP remote file inclusion vulnerability in admin/addentry.php in phpBB Advanced Guestbook 2.4.0 and earlier, when registerglobals is enabled, allows remote attackers to include arbitrary files via the phpbbrootpath parameter.
SQL injection vulnerability in guestbook.php in Advanced Guestbook 2.4 for phpBB allows remote attackers to execute arbitrary SQl commands via the entry parameter.
Cross-site scripting (XSS) vulnerability in guestbook.php in Advanced Guestbook 2.4 for phpBB allows remote attackers to inject arbitrary web script or HTML via the entry parameter. NOTE: this issue might be resultant from SQL injection.