Agent Intel Cors Security Misconfig Audit

{
  "checkedAt": "2026-10-23T09:35:21.968Z",
  "findings": [
    {
      "detail": "server echoes an arbitrary origin",
      "issue": "origin-reflection",
      "severity": "high"
    },
    {
      "detail": "server allows the null origin",
      "issue": "null-origin-allowed",
      "severity": "medium"
    }
  ],
  "level": "HIGH",
  "note": "GET responses only. Preflight (OPTIONS), other methods and authenticated responses are not tested.",
  "probes": {
    "customOrigin": {
      "allowCredentials": true,
      "allowOrigin": "https://cors-audit-probe.invalid",
      "status": 200
    },
    "noOrigin": {
      "allowCredentials": true,
      "allowOrigin": "*",
      "status": 200
    },
    "nullOrigin": {
      "allowCredentials": true,
      "allowOrigin": "null",
      "status": 200
    }
  },
  "source": "https://httpbin.org/get",
  "url": "https://httpbin.org/get"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.fadeandco.workers.dev/api/agent-intel/cors-security-misconfig-audit?url=https%3A%2F%2Fhttpbin.org%2Fget'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://api.fadeandco.workers.dev/api/agent-intel/cors-security-misconfig-audit?url=https%3A%2F%2Fhttpbin.org%2Fget' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.fadeandco.workers.dev%2Fapi%2Fagent-intel%2Fcors-security-misconfig-audit
const res = await pay("https://api.fadeandco.workers.dev/api/agent-intel/cors-security-misconfig-audit?url=https%3A%2F%2Fhttpbin.org%2Fget");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.fadeandco.workers.dev/api/agent-intel/cors-security-misconfig-audit?url=https%3A%2F%2Fhttpbin.org%2Fget")
    print(res.status_code, res.text)