PHP-Nuke 4.4.1a allows remote attackers to modify a user's email address and obtain the password by guessing the user id (UID) and calling user.php with the saveuser operator.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2001-0292
http://archives.neohapsis.com/archives/bugtraq/2001-02/0525.html