Cross-site scripting (XSS) vulnerability in phpGB before 1.20 allows remote attackers to inject arbitrary HTML or script into guestbook pages, which is executed when the administrator deletes the entry.

savesettings.php in phpGB 1.20 and earlier does not require authentication, which allows remote attackers to cause a denial of service or execute arbitrary PHP code by using savesettings.php to modify config.php.

SQL injection vulnerability in login.php for phpGB 1.20 and earlier, when magic_quotes_gpc is not enabled, allows remote attackers to gain administrative privileges via SQL code in the password entry.