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  3. Mass Assignment Privilege Escalation
EasyVDP30 min

Mass Assignment Privilege Escalation

By @gorka

Plataforma de recetas de cocina donde el endpoint de registro acepta el campo 'role' sin validacion, permitiendo registrarse como administrador y acceder al panel con datos sensibles y la flag del sistema.

1.4K views82 completedUpdated Sep 2026
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Hackers who solved it· 8

jimmysitomiguel171
@jimmysitomiguel171 day ago
bizedtv2
@bizedtv11 days ago
orangelpbx3
@orangelpbx14 days ago
faakrouh
@faakrouh16 days ago
DA
@david.pow.m19 days ago
r00thor
@r00thor21 days ago
l1ghtn1ng
@l1ghtn1ng22 days ago
<d4r1c4r0>
@<d4r1c4r0>22 days ago

Objectives

1
Registrar una cuenta y analizar la respuesta JSON del servidor
2
Intentar acceder al panel admin y recibir un 403
3
Descubrir que el body del registro acepta el campo role
4
Registrar nueva cuenta con role: admin
5
Acceder al dashboard administrativo y obtener la flag

Information

Difficulty
Easy
Duration
30 min
Bounty
VDP
Completed
82
Creator
gorka@gorka
Updated
Sep 2026

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Reproduce it and find the bug yourself

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Tools

Burp Suite

Prerequisites

  • - Conocimiento basico de APIs REST y JSON
  • - Saber interceptar/modificar peticiones HTTP

Tags

API Abuse

Achievement you'll earn

Solve this lab to unlock this shareable achievement

BBLABS.ESLab Solved
EasyVDP
// achievement_unlocked

Mass Assignment Privilege Escalation

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

Community writeups

Credenciales

Usuario Contrasena Rol
gordon password123 user
julia password123 user
marco password123 admin

Despliegue

# Opcion 1: autodeploy
./autodeploy.sh

# Opcion 2: manual
docker compose up --build

# Acceder
https://localhost:1002

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

Para parar:

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

Contenido del Lab

La aplicacion

ChefHub es una plataforma social de recetas donde los usuarios comparten sus creaciones culinarias, exploran recetas de otros chefs, y los administradores gestionan el contenido y los usuarios.

La vulnerabilidad

El endpoint POST /api/auth/register acepta el campo role directamente del body JSON sin ningun filtrado. Aunque la interfaz web no envia este campo, un atacante puede anadirlo manualmente para obtener privilegios de admin.

Cadena de ataque

1. Registrarse normalmente → response muestra role: user
2. Intentar GET /api/admin/stats → 403 Forbidden
3. Registrar con {... , role: admin} → role: admin!
4. Login → Acceso completo al panel admin
5. Flag en /api/admin/stats

Solucion interactiva

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

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