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Chocolate
Challenge
If you could become admin you would get a flag.
Solution website said You're not an admin. Please leave this site.
Found a cookie containing value e2FkbWluOmZhbHNlfQ==
, base64 decodes to {admin:false}
, change the cookie to base64("{admin:true}")
and reload the page gave the flag
Flag
ABCTF{don't_trust_th3_coooki3}