Exploiting Promo Code Flaw: Abusing Codes to Buy Items for Free In the world of online shopping, promo codes are a popular method for consumers to access discounts, special offers, and free products …

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A security researcher discovered a promo code vulnerability in an e-commerce platform where codes followed a predictable format (e.g., PROMO123456). The server only validated the numeric portion of the code and lacked rate limiting, allowing attackers to brute-force valid codes using Burp Suite Intruder. Successful exploitation reduced cart totals to zero, enabling free product acquisition. The writeup emphasizes the need for proper input validation and rate limiting on promo code endpoints.