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  3. Open Redirect in Checkout Flow
EasyVDP15 min

Open Redirect in Checkout Flow

By @gorka

E-commerce donde el flujo de checkout acepta un parametro redirect_url sin validacion, permitiendo redirigir al usuario a un sitio malicioso tras la compra.

496 views34 completedUpdated Aug 2026
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Hunters who solved it· 8

danielmijan111
@danielmijan113 days ago
HO2
@horseman6 days ago
rodegarrido13
@rodegarrido18 days ago
retryx00
@retryx008 days ago
cyzk0
@cyzk08 days ago
VA
@vazquezdv1820059 days ago
maguin
@maguin9 days ago
jbap102
@jbap10211 days ago

Objectives

1
Encontrar el parametro redirect_url en el checkout
2
Enviar una URL externa como valor
3
Demostrar la redireccion abierta

Information

Difficulty
Easy
Duration
15 min
Bounty
VDP
Completed
34
Creator
gorka@gorka
Updated
Aug 2026

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Tools

NavegadorBurp Suite

Prerequisites

  • Concepto de Open Redirect
  • Manipulacion basica de URLs

Tags

Open Redirect

Achievement you'll earn

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BBLABS.ESLab Solved
EasyVDP
// achievement_unlocked

Open Redirect in Checkout Flow

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

Community writeups

Despliegue

# Opcion 1: autodeploy
./autodeploy.sh

# Opcion 2: manual
docker compose up --build

# Acceder
http://localhost:2002

Compatible con macOS, Linux y Windows (Docker Desktop / WSL).

Para parar:

./autodeploy.sh destroy
# o: docker compose down -v

Contenido del Lab

La aplicacion

SkyHaven es un e-commerce con flujo de checkout que redirige al usuario tras completar la compra.

La vulnerabilidad

POST /api/checkout acepta redirect_url sin validacion. Cualquier URL (incluidas externas) se usa como destino de redireccion.

Cadena de ataque

1. Completar checkout normal → redireccion a /thank-you
2. Interceptar y cambiar redirect_url a https://evil.com
3. Victima completa compra → redirigida a sitio malicioso

Solucion interactiva

Accede a /writeup dentro de la aplicacion para una guia paso a paso con botones interactivos.

Flag

(redireccion exitosa a sitio externo)

Remediacion

  1. Validar que la URL de redireccion es relativa o pertenece al dominio
  2. Whitelist de URLs de redireccion permitidas
  3. No aceptar URLs absolutas como parametro

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