Let’s play a game: what is the deadly bug here?

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This short php code contains a critical vulnerability. In this video I will explain in detail what I think while analysing it.

Original source of challenge: https://www.securify.nl/en/blog/SFY20180101/spot-the-bug-challenge-2018-warm-up.html
Link to tweet: https://twitter.com/xxByte/status/951499972582703104

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