Multiple cross-site scripting (XSS) vulnerabilities in phpCommunityCalendar 4.0.3, and possibly earlier versions, allow remote attackers to inject arbitrary web script or HTML via the LocationID parameter to (1) thankyou.php or (2) day.php, font parameter to (3) calDaily.php, (4) calMonthly.php, (5) calMonthlyP.php, (6) calWeekly.php, (7) calWeeklyP.php, (8) calYearly.php, (9) calYearlyP.php, (10) day.php, or (11) week.php, or (12) CeTi, (13) Contact, (14) Description, (15) ShowAddress parameter to event.php, and other attack vectors.

Multiple SQL injection vulnerabilities in phpCommunityCalendar 4.0.3, and possibly earlier versions, allow remote attackers to execute arbitrary SQL commands via the (1) login field in login.php or (2) LocationID parameter to week.php.