WebCalendar is a PHP-based calendar application that can be configured as a single-user calendar, a multi-user calendar for groups of users, or as an event calendar viewable by visitors. See project homepage for details: http://www.k5n.us/webcalendar.php Description: The problem is that different error messages are returned depending on whether an unsuccessful login attempt is performed with a valid or invalid username in the login page. Error message extract from 'includes/user.php' can be "Invalid login" "Invalid login: incorrect password" "Invalid login: no such user" The weakness has been confirmed in version 1.0.1, 1.0.2, 1.0.3. Other versions may also be affected. David Maciejak