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  1. Home
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  3. Content Security Policy Bypass Challenges
HardVDP1h

Content Security Policy Bypass Challenges

By @gorka

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Hunters who solved it· 8

kaneki1
@kaneki8 days ago
flyingwhales2
@flyingwhales10 days ago
r4mattra

Achievement you'll earn

Solve this lab to unlock this shareable achievement

BBLABS.ESLab Solved
HardVDP
// achievement_unlocked

Content Security Policy Bypass Challenges

XSS
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:2200

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

Para parar:

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

Contenido del Lab

La aplicacion

Plataforma con 8 niveles de CSP progresivamente mas restrictivos. El objetivo es ejecutar alert(1) en cada uno.

La vulnerabilidad

Cada nivel tiene una configuracion CSP diferente con un bypass especifico: unsafe-inline, data:, unsafe-eval, wildcard, JSONP callback, CDN con AngularJS, nonce estatico, y script echo reflection.

Cadena de ataque

Nivel 1: unsafe-inline → <script>alert(1)</script>
Nivel 2: data: → <script src=data:,alert(1)>
Nivel 3: unsafe-eval → eval('alert(1)')
Nivel 4: * wildcard → cargar script externo
Nivel 5: JSONP → callback=alert(1)
Nivel 6: CDN → AngularJS ng-app con expresiones
Nivel 7: nonce hardcoded → reusar nonce
Nivel 8: script echo → reflected input en script

Solucion interactiva

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


Flag

(alert(1) en cada desafio)

Remediacion

  1. Nunca usar unsafe-inline o unsafe-eval
  2. Usar nonces aleatorios por peticion
  3. Whitelist estricto de dominios
  4. Evitar JSONP endpoints
  5. No reflejar input dentro de bloques script

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© 2026 BBLABS v2 — All rights reserved

8 desafios progresivos para bypassear diferentes configuraciones de Content Security Policy y ejecutar alert(1).

252 views8 completedUpdated Aug 2026
Log in to start
3
@r4mattra
12 days ago
AL
@alex.burja.200029 days ago
benjaminnocervigni
@benjaminnocervigni29 days ago
w4tchw0lf
@w4tchw0lfJun 2026
pl4nkton
@pl4nktonJun 2026
gorka
@gorkaApr 2026

Objectives

1
Bypassear unsafe-inline
2
Explotar data: URIs
3
Bypassear unsafe-eval
4
Abusar de wildcards *
5
Explotar JSONP endpoints
6
Usar CDN (AngularJS) para bypass
7
Explotar nonces hardcodeados
8
Bypassear via script echo

Information

Difficulty
Hard
Duration
1h
Bounty
VDP
Completed
8
Creator
gorka@gorka
Updated
Aug 2026

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Tools

Navegador

Prerequisites

  • CSP basico y avanzado
  • XSS avanzado
  • JavaScript y DOM manipulation

Tags

XSS