admin/userform.php in RoomPHPlanning 1.5 does not require administrative credentials, which allows remote authenticated users to create new admin accounts.

SQL injection vulnerability in RoomPHPlanning 1.5 allows remote attackers to execute arbitrary SQL commands via the idresa parameter to resaopen.php.

SQL injection vulnerability in RoomPHPlanning 1.5 allows remote attackers to execute arbitrary SQL commands via the idroom parameter to weekview.php.

Multiple SQL injection vulnerabilities in RoomPHPlanning 1.6 allow remote attackers to execute arbitrary SQL commands via (1) the loginus parameter to Login.php or (2) the Old Password field to changepwd.php, and allow (3) remote authenticated administrators to execute arbitrary SQL commands via the id parameter to admin/userform.php.

admin/delitem.php in RoomPHPlanning 1.6 does not require authentication, which allows remote attackers to (1) delete arbitrary users via the user parameter or (2) delete arbitrary rooms via the room parameter.

Login.php in RoomPHPlanning 1.6 allows remote attackers to bypass authentication and obtain administrative access by setting the room_phplanning cookie to a value associated with the admin account.