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  3. Open Redirect con Referer Check + Domain Bypass (@)
Medium$14030 min

Open Redirect con Referer Check + Domain Bypass (@)

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This bug paid $140 on YesWeHack.

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40 flags captured this week
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Hunters who solved it· 8

VA1
@vazquezdv1820052 days ago
flyingwhales2
@flyingwhales14 days ago
r4mattra

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BBLABS.ESLab Solved
Medium$140
// achievement_unlocked

Open Redirect con Referer Check + Domain Bypass (@)

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

Community writeups

Cadena de ataque

1. Explorar la app → descubrir posts patrocinados con tracking URLs
2. Analizar: /ads/tr?ci=X&e=sk&tu=https://cdn.snapvibe.com/...
3. Probar sin Referer → 401
4. Probar con Referer válido → 302 (funciona)
5. Probar tu=https://evil.com → 400 (dominio no whitelisted)
6. Bypass dominio: tu=http://cdn.snapvibe.com@localhost:9999 → 302!
7. Publicar link completo como comentario en una foto
8. Bot clicka → sigue redirect → llega a attacker con X-Secret-Token
9. Flag: ......

Credenciales

Usuario Contraseña Rol
sarah_photo password123 user
mike_design password123 user
elena_travel password123 user

Despliegue

./autodeploy.sh
# o: docker compose up --build
# Acceder: http://localhost:1000

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By @gorka

Red social de fotos con endpoint de tracking publicitario vulnerable a open redirect. El endpoint valida Referer (bypass: publicar link en la plataforma) y dominio de destino (bypass: RFC 3986 @ syntax). Un bot clicka links de comentarios con un header secreto que contiene la flag

260 views13 completedUpdated Aug 2026
Log in to start
3
@r4mattra
23 days ago
AL
@alex.burja.200029 days ago
0xyo
@0xyoJun 2026
gorka
@gorkaJun 2026
pl4nkton
@pl4nktonJun 2026
h4xthan
@h4xthanApr 2026

Objectives

1
Explorar la app → descubrir posts patrocinados con tracking URLs
2
Analizar: /ads/tr?ci=X&e=sk&tu=https://cdn.snapvibe.com/...
3
Probar sin Referer → 401
4
Probar con Referer válido → 302 (funciona)
5
Probar tu=https://evil.com → 400 (dominio no whitelisted)
6
Bypass dominio: tu=http://cdn.snapvibe.com@localhost:9999 → 302!
7
Publicar link completo como comentario en una foto
8
Bot clicka → sigue redirect → llega a attacker con X-Secret-Token

Information

Platform
YesWeHack
Difficulty
Medium
Duration
30 min
Bounty
$140
Completed
13
Creator
gorka@gorka
Updated
Aug 2026

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Reproduce it and find the bug yourself

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Tools

BurpSuite

Prerequisites

  • Conocimientos sobre Open Redirect Básicos
  • Conocimientos sobre Headers

Tags

Open Redirect