How to solve reCaptcha V2 Callback | Low Security Level

[CAPTCHAFORUM]

Sometimes there's no submit button and a callback function is used isntead. The function is executed when reCaptcha is solved.

1. Open developer's console in your browser and find element with data-sitekey attribute.

2. Send sitekey and pageurl to 2Captcha API.

PHP

// https://github.com/2captcha/2captcha-php

require(__DIR__ . '/../src/autoloader.php');

$solver = new \TwoCaptcha\TwoCaptcha('YOUR_API_KEY');

try {
    $result = $solver->recaptcha([
        'sitekey' => '6LeIxboZAAAAAFQy7d8GPzgRZu2bV0GwKS8ue_cH',
        'url'     => 'https://2captcha.com/demo/recaptcha-v2-callback',
    ]);
} catch (\Exception $e) {
    die($e->getMessage());
}

die('Captcha solved: ' . $result->code);

PYTHON

# https://github.com/2captcha/2captcha-python

import sys
import os

sys.path.append(os.path.dirname(os.path.dirname(os.path.realpath(__file__))))

from twocaptcha import TwoCaptcha

api_key = os.getenv('APIKEY_2CAPTCHA', 'YOUR_API_KEY')

solver = TwoCaptcha(api_key)

try:
    result = solver.recaptcha(
        sitekey='6LeIxboZAAAAAFQy7d8GPzgRZu2bV0GwKS8ue_cH',
        url='https://2captcha.com/demo/recaptcha-v2-callback')

except Exception as e:
    sys.exit(e)

else:
    sys.exit('solved: ' + str(result))

JAVA

// https://github.com/2captcha/2captcha-java

package examples;

import com.twocaptcha.TwoCaptcha;
import com.twocaptcha.captcha.ReCaptcha;

public class ReCaptchaV2Example {

    public static void main(String[] args) {
        TwoCaptcha solver = new TwoCaptcha("YOUR_API_KEY");

        ReCaptcha captcha = new ReCaptcha();
        captcha.setSiteKey("6LeIxboZAAAAAFQy7d8GPzgRZu2bV0GwKS8ue_cH");
        captcha.setUrl("https://2captcha.com/demo/recaptcha-v2-callback");

        try {
            solver.solve(captcha);
            System.out.println("Captcha solved: " + captcha.getCode());
        } catch (Exception e) {
            System.out.println("Error occurred: " + e.getMessage());
        }
    }

}

CSHARP

// https://github.com/2captcha/2captcha-csharp

using System;
using System.Linq;
using TwoCaptcha.Captcha;

namespace TwoCaptcha.Examples
{
    public class ReCaptchaV2Example
    {
        public void Main()
        {
            TwoCaptcha solver = new TwoCaptcha("YOUR_API_KEY");

            ReCaptcha captcha = new ReCaptcha();
            captcha.SetSiteKey("6LeIxboZAAAAAFQy7d8GPzgRZu2bV0GwKS8ue_cH");
            captcha.SetUrl("https://2captcha.com/demo/recaptcha-v2-callback");

            try
            {
                solver.Solve(captcha).Wait();
                Console.WriteLine("Captcha solved: " + captcha.Code);
            }
            catch (AggregateException e)
            {
                Console.WriteLine("Error occurred: " + e.InnerExceptions.First().Message);
            }
        }
    }
}

GO

// https://github.com/2captcha/2captcha-go

package main

import (
    "fmt"
    "log"
    "github.com/2captcha/2captcha-go"
)

func main() {
    client := api2captcha.NewClient("API_KEY")
  
    cap := api2captcha.ReCaptcha{
        SiteKey: "6LeIxboZAAAAAFQy7d8GPzgRZu2bV0GwKS8ue_cH",
        Url: "https://2captcha.com/demo/recaptcha-v2-callback",
    }
  
    code, err := client.Solve(cap.ToRequest())
  
    if err != nil {
        log.Fatal(err);
    }
  
    fmt.Println("code "+code)
}

CPP

// https://github.com/2captcha/2captcha-cpp

#include <cstdio>

#include "curl_http.hpp"
#include "api2captcha.hpp"

int main (int ac, char ** av)
{
   api2captcha::curl_http_t http;
   http.set_verbose (true);

   api2captcha::client_t client;
   client.set_http_client (&http);
   client.set_api_key (API_KEY);

   api2captcha::recaptcha_t cap;
   cap.set_site_key ("6LeIxboZAAAAAFQy7d8GPzgRZu2bV0GwKS8ue_cH");
   cap.set_url ("https://2captcha.com/demo/recaptcha-v2-callback");

   try
   {
      client.solve (cap);
      printf ("code '%s'\n", cap.code ().c_str ());
   }
   catch (std::exception & e)
   {
      fprintf (stderr, "Failed: %s\n", e.what ());
   }

   return 0; 
}

Wait for the result, which may look like this:

03AGdBq27lvCYmKkaqDdxWLfMe3ovADGfGlSyiR-fN_EJrZGniTAmdH1XSjK8ralsctfjOLX2K0T7dJfxPqqga8dtSG2Lmns8Gk2ckcU6PQzUFieBqrtpkr5PPwnngew0Rnot2ik1y8m202u6pHTIquExlEYSlzS8vfoyPPt8fCf-Zrbu8vWkiY8Ogj17ommHMgkguZbmEyOdfLTXzhRko-a655_jJdCMjEtMxva-b78DnGlXu9d0o6vEmrw9n8ABu4lLsWnIbYPH0beXRRIkUE3si64Xhwkh1aO3L1HaIR3sfR0vOs3GV1OBzry_tFsZM0ZhSQovKJwjLlotrYajyTSRv3hgvXtLlLxXzbAwgeI91-wM7AFEte0uO_DhcNajxZr7E50wU9vuAe_drGWe4q-hNx4PQPenjaw

3. In developer's console, find textarea with id="g-recaptcha-response", and put there received code. Then, submit the form.