Calendarix 0.7.20070307 allows remote attackers to obtain sensitive information via (1) an invalid month[] parameter to calendar.php, (2) an invalid catview[] parameter to cal_week.php in a week operation, (3) an invalid ycyear[] parameter to yearcal.php, or (4) a direct request to cal_functions.inc.php, which reveals the installation path in various error messages.