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  3. OAuth Authorization Code Theft via Open Redirect
MediumVDP30 min

OAuth Authorization Code Theft via Open Redirect

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Hunters who solved it· 8

VA1
@vazquezdv1820053 days ago
AL2
@alndrwla9 days ago
flyingwhales

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BBLABS.ESLab Solved
MediumVDP
// achievement_unlocked

OAuth Authorization Code Theft via 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:2003

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 autenticacion OAuth y un proveedor de identidad simulado.

La vulnerabilidad

El endpoint /oauth/authorize acepta redirect_uri sin validar contra una whitelist. El atacante puede especificar su propio servidor como destino y recibir el codigo de autorizacion de la victima.

Cadena de ataque

1. Analizar flujo OAuth normal
2. Modificar redirect_uri a https://attacker.com/callback
3. Enviar link a victima
4. Victima autoriza → codigo enviado a attacker
5. Usar codigo para obtener token de acceso

Solucion interactiva

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


Flag

(codigo de autorizacion OAuth robado)

Remediacion

  1. Validar redirect_uri contra whitelist estricta
  2. Comparacion exacta de redirect_uri registradas
  3. No usar wildcards en URIs de redireccion

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© 2026 BBLABS v2 — All rights reserved

By @gorka

E-commerce con proveedor OAuth falso que acepta cualquier redirect_uri, permitiendo robar el codigo de autorizacion via redireccion abierta.

238 views14 completedUpdated Aug 2026
Log in to start
3
@flyingwhales
14 days ago
r4mattra
@r4mattra24 days ago
AL
@alex.burja.200029 days ago
w4tchw0lf
@w4tchw0lfJun 2026
pl4nkton
@pl4nktonJun 2026
0X
@0xch4rlygrMay 2026

Objectives

1
Entender el flujo OAuth de la aplicacion
2
Descubrir que el proveedor OAuth no valida redirect_uri
3
Crafear una URL con redirect_uri apuntando a sitio externo
4
Interceptar el codigo de autorizacion

Information

Difficulty
Medium
Duration
30 min
Bounty
VDP
Completed
14
Creator
gorka@gorka
Updated
Aug 2026

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Tools

NavegadorBurp SuiteServidor web

Prerequisites

  • Flujo OAuth 2.0 (Authorization Code)
  • Open Redirect
  • Manipulacion de URLs

Tags

Open Redirect