ebCTF: NET100 “index.php?-s”

OMG, Eindbazen got hacked. Can you figure out what this evil hacker did?

This was an easy challenge, and pretty straight forward what to do. It was meant to be solved by a lot of teams, and they did, 145 teams managed to solve it. There are a lot of write-ups for this challenge, so I will explain in short what was the intended solution.
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