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  3. URL Shortener Open Redirect
EasyVDP15 min

URL Shortener Open Redirect

By @gorka

E-commerce con servicio de acortamiento de URLs que acepta cualquier destino sin validacion, creando redirecciones abiertas con URLs del dominio confiable.

368 views28 completedUpdated Aug 2026
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Hunters who solved it· 8

kaneki1
@kaneki3 days ago
HO2
@horseman6 days ago
retryx00

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BBLABS.ESLab Solved
EasyVDP
// achievement_unlocked

URL Shortener Open Redirect

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:2001

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 con servicio de URL shortening integrado.

La vulnerabilidad

POST /api/shorten acepta cualquier URL sin validacion. Genera un shortlink del dominio confiable que redirige al destino malicioso.

Cadena de ataque

1. POST /api/shorten con url=https://evil.com
2. Obtener URL corta: https://skyhaven.com/s/abc123
3. Compartir URL corta (parece confiable)
4. Victima clica → redirigida a evil.com

Solucion interactiva

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

Flag

(URL acortada redirige a sitio externo)

Remediacion

  1. Bloquear URLs externas sospechosas
  2. Mostrar pagina de advertencia antes de redirigir
  3. Rate limiting en creacion de short URLs

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3
@retryx00
7 days ago
VA
@vazquezdv1820057 days ago
cyzk0
@cyzk08 days ago
jbap102
@jbap10211 days ago
flyingwhales
@flyingwhales18 days ago
MA
@mattkingst18 days ago

Objectives

1
Usar el servicio de URL shortening
2
Crear URL corta que apunte a sitio malicioso
3
Demostrar que la URL del dominio confiable redirige a un sitio externo

Information

Difficulty
Easy
Duration
15 min
Bounty
VDP
Completed
28
Creator
gorka@gorka
Updated
Aug 2026

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Tools

Navegador

Prerequisites

  • Open Redirect basico

Tags

Open Redirect