BBLABS v2BBLABSv2
>Home>Labs
>New labs

Latest 3 labs

Loading…

View all labs →
>Creators>Ranking
>Learn

Learn bug bounty

AcademyGuides, cheatsheets and glossaryVulnerabilitiesXSS, SQLi, IDOR, SSRF and moreHacker RoadmapYour step-by-step bug bounty pathBlogBug bounty guides and news
>Business>Pricing
ES
Log inLog in
>Home>Labs>New labs>Creators>Ranking>Learn>Business>Pricing
ES
Sign inCreate account
  1. Home
  2. Labs
  3. IDOR + CORS Chain Attack
Hard$5045 min

IDOR + CORS Chain Attack

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

448 views20 completedUpdated Sep 2026
Log in to start

Learn to find this bug

This bug paid $50 on YesWeHack.

Create your account and practice real bugs that got paid. Download the environment, find it and learn the exact technique — your path to your first bounty.

650

hunters training

50

labs from real hacks

380

completions

$12,000

paid out for these bugs

40 flags captured this week
Create account
I already have an account

Access to all labs · no commitment · cancel anytime

Hackers who solved it· 8

CR1
@crash9 days ago
benjaminnocervigni2
@benjaminnocervigniAug 2026
flyingwhales3
@flyingwhalesJul 2026
kaneki
@kanekiJul 2026
AL
@alex.burja.2000Jul 2026
gorka
@gorkaJun 2026
pl4nkton
@pl4nktonJun 2026
AT
@atxMay 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
20
Creator
gorka@gorka
Collaborators
antoniorivera@antoniorivera
Updated
Sep 2026

Download the environment

Reproduce it and find the bug yourself

Create account

Tools

Burp Suite

Prerequisites

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

Tags

IDORBusiness Logic

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
Sep 2026
gorka
solved_by@gorkaMember since Mar 2026
bblabs.es// real hacking 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

Contact

Practice, learn and hack

Bug bounty practice platform with labs based on real hacks. Learn ethical hacking in safe environments.

contact→

Follow us

YouTube
@0xGorka
X
@gorkaelbochi
LinkedIn
gorka-el-bochi-morillo
Instagram
@_.gorkaaa.b
Email
team@bblabs.es

Access every lab from €7.99/mo

New labs every week. Cancel anytime.

Create account

BBLabs is the bug bounty labs platform where you learn bug bounty with real vulnerabilities extracted from paid hacks on HackerOne, YesWeHack and Bugcrowd. Here you practice web hacking —XSS, SQLi, IDOR, SSRF, CSRF and more— in downloadable environments, capture the flag, read the writeup and apply the technique on active bug bounty programs.

BBLabs is the alternative to HackTheBox, TryHackMe and PentesterLab for those who want to practice bug bounty with real hacks instead of artificial CTFs. From €7.99/mo, no commitment.

→ Learn bug bounty from scratch→ How to do bug bounty step by step→ Real bug bounty reports→ BBLabs for companies and academiesLabsAcademyVulnerabilitiesToolsHacker rankingXSS labsIDOR labsSSRF labsCSRF labsHackTheBox alternativeHack4u alternativeTryHackMe alternativePortSwigger alternativePentesterLab alternativeBug Bounty Labs comparisonHackerOne to practiceOffSec / OSCP alternativeINE / eWPT alternativeHTB Academy alternativeDVWA alternativeJuice Shop alternativeVulnHub alternativePentesterAcademy alternativeRoot-Me alternativeHackTheBox vs TryHackMeBest bug bounty platforms 2026BlogSpoilersWhat is bug bounty?How much do you earn in bug bounty?OWASP Top 10 explainedBest sites to practice web hackingHow to become an ethical hacker from scratchBurp Suite tutorial (Spanish)OSCP guide and prepGoogle Dorks for bug bountyHow much an ethical hacker earns in SpainBug bounty tools 2026Best cybersecurity certifications 2026Burp Suite tutorialsqlmap tutorialffuf web fuzzingnuclei tutorialHTTP Request SmugglingWAF bypassPrompt injection (LLM)Google Dorks
Made withand code
TermsPrivacyCookiesComparisonES

© 2026 BBLABS v2 — All rights reserved