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  3. Business Logic Error - Payment Bypass via Client-Side Trust Abuse
Hard$4,45020 min

Business Logic Error - Payment Bypass via Client-Side Trust Abuse

By @hidalg0d

HackenStore es una tienda online ambientada en Dragon Ball pero simulando un entorno 100% real, vulnerable que permite a un atacante comprar cualquier producto sin pagar. El flujo de checkout ofrece "ScanPay" como método de pago por QR: El frontend genera un QR Hace polling al endpoint /api/payment/status/{paymentId} cada 2 segundos El problema: El backend confía ciegamente en el dato enviado por el cliente, confirmando el pedido sin verificar el estado real del pago contra el procesador.

616 views17 completedUpdated Aug 2026
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Hunters who solved it· 8

zynap1
@zynap5 days ago
flyingwhales2
@flyingwhales7 days ago
kaneki

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Business Logic Error - Payment Bypass via Client-Side Trust Abuse

Business Logic
Aug 2026
gorka
solved_by@gorkaMember since Mar 2026
bblabs.es// real bug bounty practice

Community writeups

HackenStore es una tienda online ambientada en Dragon Ball pero simulando un entorno 100% real, vulnerable que permite a un atacante comprar cualquier producto sin pagar.

El flujo de checkout ofrece "ScanPay" como método de pago por QR:

El frontend genera un QR
Hace polling al endpoint /api/payment/status/{paymentId} cada 2 segundos

El problema:
El backend confía ciegamente en el dato enviado por el cliente, confirmando el pedido sin verificar el estado real del pago contra el procesador.

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3
@kaneki
8 days ago
AL
@alndrwla22 days ago
XL
@xl4n25 days ago
AL
@alex.burja.200029 days ago
pl4nkton
@pl4nktonJun 2026
benjaminnocervigni
@benjaminnocervigniMay 2026

Objectives

1
Comprender el flujo cliente-servidor en sistemas de pago modernos (QR, polling, confirmación)
2
Identificar errores de lógica de negocio donde el backend confía en datos críticos enviados por el cliente
3
Obtener la flag obteniendo un producto sin pagar un Zeni :)

Information

Platform
YesWeHack
Difficulty
Hard
Duration
20 min
Bounty
$4,450
Completed
17
Creator
hidalg0d@hidalg0d
Updated
Aug 2026

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Tools

Burp Suite, Navegador, Docker, Node.js

Prerequisites

  • Conocimientos básicos de HTTP (request/response, JSON, status codes)
  • Burp Suite (Community o Pro) instalado
  • Docker + docker-compose o Node.js 18+
  • Familiaridad con arquitectura cliente-servidor
  • Conceptos básicos de APIs REST

Tags

Business Logic