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  3. SSRF via HTML Injection in PDF Generation
HardVDP45 min

SSRF via HTML Injection in PDF Generation

By @gorka

Plataforma de archivos donde la generacion de facturas PDF usa Puppeteer para renderizar HTML. El campo de direccion acepta HTML raw, permitiendo inyectar un iframe al servicio de admin interno.

177 views14 completedUpdated Aug 2026
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Hunters who solved it· 8

itrox1
@itrox5 days ago
flyingwhales2
@flyingwhales8 days ago
AL3
@alndrwla27 days ago
AL
@alex.burja.200029 days ago
SU
@suraxddqJun 2026
gorka
@gorkaJun 2026
pl4nkton
@pl4nktonJun 2026
benjaminnocervigni
@benjaminnocervigniJun 2026

Objectives

1
Comprar un producto y generar factura PDF
2
Descubrir que el campo address se renderiza como HTML en el PDF
3
Inyectar un iframe apuntando a http://127.0.0.1:9999
4
Descargar el PDF con el contenido del admin panel interno

Information

Difficulty
Hard
Duration
45 min
Bounty
VDP
Completed
14
Creator
gorka@gorka
Updated
Aug 2026

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Tools

Burp SuiteNavegador

Prerequisites

  • SSRF avanzado
  • HTML injection
  • Conocimiento de generacion de PDFs server-side

Tags

SSRF

Achievement you'll earn

Solve this lab to unlock this shareable achievement

BBLABS.ESLab Solved
HardVDP
// achievement_unlocked

SSRF via HTML Injection in PDF Generation

SSRF
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:1200

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

Para parar:

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

Contenido del Lab

La aplicacion

FileForge con e-commerce, facturacion PDF (Puppeteer) y servicio de administracion interno en puerto 9999.

La vulnerabilidad

La factura PDF se genera con Puppeteer renderizando HTML. El campo de direccion del usuario se inserta como HTML raw (sin sanitizar). Inyectando <iframe src="http://127.0.0.1:9999"> se fuerza a Puppeteer a cargar el admin panel interno dentro del PDF.

Cadena de ataque

1. Registrarse y editar perfil
2. Poner como direccion: <iframe src=\"http://127.0.0.1:9999\" width=\"100%\" height=\"600\">
3. Comprar producto → generar factura
4. Descargar PDF → admin panel visible
5. Flag en el panel de administracion

Solucion interactiva

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

Flag

e10adc3949ba59abbe56e057f20f883e

Remediacion

  1. Sanitizar HTML en todos los campos antes de renderizar
  2. No usar Puppeteer para renderizar datos de usuario sin sanitizar
  3. Bloquear acceso a red interna desde el renderizador
  4. Usar templates con datos escapados

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