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EasyVDP15 min

Open Redirect in Login/Logout

By @gorka

E-commerce con parametros login_url y logout_url que redirigen sin validacion tras autenticacion, usables para phishing.

342 views34 completedUpdated Aug 2026
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Hunters who solved it· 8

kaneki1
@kaneki3 days ago
HO2
@horseman6 days ago
retryx003
@retryx007 days ago
cyzk0
@cyzk08 days ago
VA
@vazquezdv1820059 days ago
unicomanu
@unicomanu9 days ago
jbap102
@jbap10211 days ago
puptoper800
@puptoper80016 days ago

Objectives

1
Encontrar ?login_url= en la URL de login
2
Encontrar ?logout_url= en logout
3
Redirigir a un sitio externo tras login/logout

Information

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

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Tools

NavegadorBurp Suite

Prerequisites

  • Open Redirect basico

Tags

Open Redirect

Achievement you'll earn

Solve this lab to unlock this shareable achievement

BBLABS.ESLab Solved
EasyVDP
// achievement_unlocked

Open Redirect in Login/Logout

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:2000

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 e-commerce con login y logout que soportan URL de redireccion.

La vulnerabilidad

El login acepta ?login_url= (POST-based redirect despues del login) y logout acepta ?logout_url= (GET-based redirect). Ninguno valida el destino.

Cadena de ataque

1. Crafear URL: /login?login_url=https://evil.com
2. Victima hace login → redirigida a evil.com
3. Alternativa: /api/auth/logout?logout_url=https://evil.com

Solucion interactiva

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

Flag

(redireccion exitosa)

Remediacion

  1. Validar URLs de redireccion contra whitelist
  2. Solo aceptar paths relativos
  3. Alertar al usuario antes de redireccion externa

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