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Bypass a VIP coupon validation system to retrieve sensitive information or a specific "VIP" coupon code.

: The application might escape the attacker's backslash, turning it into a literal backslash (

Filter blocks single quote. But what if you use double quotes? The filter allows double quotes? Let’s test: input " — validation passes. Double quotes are not in the blocked set. Interesting.

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), submit it in the coupon field with a quantity of at least one to trigger the "zero charge" logic and receive your key. Key Learnings This challenge highlights that denylisting

Her heart quickened. She appended ?debug=yes to the URL.