Michlol - rashim web interface Insecure direct object references (IDOR). First of all, the attacker needs to login. After he performs log into the system there are some functionalities that the specific user is not allowed to perform. However all the attacker needs to do in order to achieve his goals is to change the value of the ptMsl parameter and then the attacker can access sensitive data that he not supposed to access because its belong to another user.