Incorrect Provision of Specified Functionality vulnerability in MESbook 20221021.03 version. An unauthenticated remote attacker can register user accounts without being authenticated from the route "/account/Register/" and in the parameters "UserName=<RANDOMUSER>&Password=<PASSWORD>&ConfirmPassword=<PASSWORD-REPEAT>".
https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-mesbook