Refund Without Ownership Verification: A Hidden Business Logic Risk
This vulnerability was a business logic flaw in the refund process of a marketplace. The application allowed anyone to initiate a refund for any item, without proper verification that they owned or possessed the item in question. By exploiting this issue, an attacker could fraudulently claim refunds for items they did not own, potentially causing financial loss and damaging the platform's reputation. To abuse the vulnerability, the researcher created a simple script to submit multiple refund requests for various products without providing any proof of ownership. The flaw stemmed from insufficient checks during the refund workflow, such as confirming that the requestor was indeed the item owner or verifying that they had already purchased the items in question. Consequences included potential financial losses and damage to the platform's reputation. The researcher reported this vulnerability to the platform, but no payout information was disclosed. To prevent such flaws, implement robust ownership verification during refund requests. Key lesson: Verify ownership during critical business transactions to avoid fraudulent activities. #BugBounty #Cybersecurity #BusinessLogicFlaw #FinancialRisk #WebSecurity


