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  3. Stored XSS to Admin Password Change
MediumVDP45 min

Stored XSS to Admin Password Change

By @gorka

Plataforma de equipo con chat donde los mensajes se renderizan con dangerouslySetInnerHTML (Stored XSS) y el cambio de contrasena no requiere la contrasena actual.

413 views30 completedUpdated Aug 2026
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Hunters who solved it· 8

cibx1
@cibx1 day ago
VA2
@vazquezdv1820055 days ago
MA3
@mattkingst11 days ago
0xyo
@0xyoJun 2026
ZN
@znbzJun 2026
trustno133
@trustno133Jun 2026
maguin
@maguinJun 2026
BL
@blckouttJun 2026

Objectives

1
Encontrar Stored XSS en los mensajes del chat
2
Descubrir que el cambio de contrasena no verifica la actual
3
Crear payload XSS que cambie la contrasena del admin
4
Acceder como admin

Information

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

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Tools

Navegador

Prerequisites

  • XSS stored basico
  • JavaScript y fetch API
  • Entender sesiones y cookies

Tags

XSS

Achievement you'll earn

Solve this lab to unlock this shareable achievement

BBLABS.ESLab Solved
MediumVDP
// achievement_unlocked

Stored XSS to Admin Password Change

XSS
Aug 2026
gorka
solved_by@gorkaMember since Mar 2026
bblabs.es// real bug bounty practice

Community writeups

Credenciales

Usuario Contrasena Rol
john_doe john123 user

Despliegue

# Opcion 1: autodeploy
./autodeploy.sh

# Opcion 2: manual
docker compose up --build

# Acceder
http://localhost:2000

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

Para parar:

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

Contenido del Lab

La aplicacion

TeamFlow es una plataforma de equipo con mensajeria y gestion de perfil.

La vulnerabilidad

Los mensajes del chat se renderizan con dangerouslySetInnerHTML sin sanitizar (Stored XSS). El endpoint PUT /api/auth/profile cambia la contrasena sin verificar la actual. Combinando ambos: XSS ejecuta un cambio de contrasena del admin.

Cadena de ataque

1. Enviar mensaje con <script> o <img onerror>
2. Verificar ejecucion de JS (Stored XSS)
3. Crear payload: fetch PUT /api/auth/profile con nueva contrasena
4. Admin lee el chat → contrasena cambiada
5. Login como admin → Panel completo

Solucion interactiva

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

Flag

(acceso al panel admin tras cambio de contrasena)

Remediacion

  1. Sanitizar HTML antes de renderizar (DOMPurify)
  2. Requerir contrasena actual para cambios
  3. Content-Security-Policy
  4. HttpOnly cookies

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