We are really sorry, but this is life. Sometimes we are teachers and sometimes we are students. We found a critical security bug in Total.js Eshop and CMS yesterday. Please follow the instructions below:
first reinstall Total.js to +v2.2.0 (npm install total.js)
check your source-code:
Open yourapp/controllers/default.js and find a file_read function and modify it as shown below: