I have a situation where I have found students that are able to signup for sessions that are full. This is causing the sessions to be overbooked. Someone in my organization sent an email containing a copy and paste version of a course front page. The course front page contained links to the available sessions at the time the email was sent. Those sessions are full but if a person recieving the email clicks on one of the session links it takes them directly to the signup page bypassing any of the capacity checking and allowing the student to signup as normal.

There needs to be some capacity checks at the sign up page to ensure that students are not able to sign up for a session that is already full.