https://blog.mingon.dev/tags/gift-card/Recent content in Gift Card on 보안 연구 노트Hugo -- gohugo.ioko-KRTue, 08 Sep 2026 20:50:00 +0900https://blog.mingon.dev/write-up/portswigger/business-logic/infinite-money-logic-flaw/Tue, 08 Sep 2026 20:50:00 +0900https://blog.mingon.dev/write-up/portswigger/business-logic/infinite-money-logic-flaw/30% 할인으로 새 $10 상품권을 $7에 구매하고 액면가를 충전하는 과정을 반복해 매회 $3씩 잔액을 늘리는 Business Logic 풀이