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  3. IDOR + CORS Chain Attack
Hard$5045 min

IDOR + CORS Chain Attack

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By @gorka

Plataforma de pedidos donde una combinacion de IDOR (acceso a pedidos ajenos) y CORS misconfiguration (reflejo de origen) permite exfiltrar datos de pedidos de otros usuarios via un ataque encadenado

252 views18 completedUpdated Aug 2026
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Hunters who solved it· 8

flyingwhales1
@flyingwhales9 days ago
kaneki2
@kaneki20 days ago
AL3
@alex.burja.200029 days ago
gorka
@gorkaJun 2026
pl4nkton
@pl4nktonJun 2026
AT
@atxMay 2026
MA
@maxioliveraMay 2026
h4xthan
@h4xthanMay 2026

Objectives

1
Descubrir IDOR en el endpoint de datos de pedidos
2
Identificar que CORS refleja cualquier origen con credenciales
3
Crear un PoC que encadene CORS + IDOR
4
Exfiltrar los datos del pedido del admin que contiene la flag

Information

Platform
YesWeHack
Difficulty
Hard
Duration
45 min
Bounty
$50
Completed
18
Creator
gorka@gorka
Collaborators

Achievement you'll earn

Solve this lab to unlock this shareable achievement

BBLABS.ESLab Solved
Hard$50
// achievement_unlocked

IDOR + CORS Chain Attack

IDORBusiness Logic
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:1900

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

Para parar:

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

Contenido del Lab

La aplicacion

SecureVision es una plataforma de pedidos con reviews de productos y un bot admin que visita las reviews.

La vulnerabilidad

POST /api/orders/getData verifica autenticacion pero NO verifica que el pedido pertenezca al usuario (IDOR). Ademas, el servidor refleja el header Origin en Access-Control-Allow-Origin con credentials: true, permitiendo peticiones cross-origin autenticadas.

Cadena de ataque

1. Registrarse y hacer un pedido
2. Descubrir IDOR: acceder a pedidos de otros
3. Descubrir CORS: Origin reflejado con credentials
4. Crear PoC JS que usa CORS para leer pedidos
5. Publicar review con link al PoC
6. Bot admin visita → PoC exfiltra IDs de pedidos
7. Usar IDs para leer datos del admin → Flag

Solucion interactiva

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

Flag

4a8a08f09d37b73795649038408b5f33

Remediacion

  1. Verificar que el usuario es dueno del recurso (fix IDOR)
  2. No reflejar Origin arbitrariamente en CORS
  3. Whitelist de origenes permitidos
  4. No enviar credentials en CORS cross-origin
antoniorivera
@antoniorivera
Updated
Aug 2026

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Tools

Burp Suite

Prerequisites

  • IDOR avanzado
  • Configuracion CORS y politicas de origen
  • JavaScript para PoC de exfiltracion

Tags

IDORBusiness Logic