Code-projects Online Restaurant Management System 1.0 is vulnerable to SQL Injection. Through SQL injection, an attacker can bypass the admin panel and view order records, add items, delete items etc.
https://gist.github.com/1337kid/d3e7702bd19cc9355a6b3f153eb2fe8e
https://code-projects.org/online-restaurant-management-system-in-php-with-source-code/