Cross-site scripting (XSS) vulnerability in header.php in PunBB 1.2.10 allows remote attackers to inject arbitrary web script or HTML via the URL, which is not properly handled when the PHP_SELF variable is used to handle a pun_page tag.
PunBB 1.2.10 and earlier allows remote attackers to conduct brute force guessing attacks for an account's password, which may be as short as 4 characters.