What is missing function level access control?

According to the Open Web Application Security Project (OWASP), missing function level access control is one of the most common and serious threats facing networks today. Vulnerabilities in terms of access control often arise due to poor protection of vital request handles in a web-based application. A range of vulnerabilities can be exposed in this manner, and every web application in your network needs to verify function level access rights for any type of action requested by any user. Checks need to be performed constantly in order to improve security and the level of damage caused is often a result of the type of data that a hacker gains access to.