Just because MathOnWeb does not save any data about you and your user behaviour, there are no real security issues. Nevertheless, there may some risks that can have an effect. There are only security updates for the latest version of MathOnWeb. So if you are using the public instance your security level is always up to date. If you hosted the application yourself, you can validate if your current version is still secure.

If you found a security risk, just create a new issue and explain how you found the risk and how I can recreate it. After that it will be fixed as soon as possible in the next update. You should also test this risk in different versions of the application, so I am able to specify which versions of the software are safe.