hacktricks/pentesting-web/captcha-bypass.md

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# Captcha Bypass
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<details>
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<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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* **Share your hacking tricks by submitting PRs to the** [**hacktricks repo**](https://github.com/carlospolop/hacktricks) **and** [**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud).
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</details>
## Captcha Bypass
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To **automate** the **testing** of some functions of the server that allows user input it **could** be **needed** to **bypass** a **captcha** implementation. Therefore, try to test for these things:
* **Do not send the parameter** related to the captcha.
* Change from POST to GET or other HTTP Verbs
* Change to JSON or from JSON
* Send the **captcha parameter empty**.
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* Check if the value of the captcha is **in the source code** of the page.
* Check if the value is **inside a cookie.**
* Try to use an **old captcha value**
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* Check if you can use the **same** captcha **value** several times with **the same or different sessionID.**
* If the captcha consists on a **mathematical operation** try to **automate** the **calculation.**
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* If the captcha consists of **read characters from an image**, check manually or with code **how many images** are being used and if only a **few images are being used, detect them by MD5.**
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* Use an **OCR** ([https://github.com/tesseract-ocr/tesseract](https://github.com/tesseract-ocr/tesseract)).
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## Online Services to bypass captchas
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### [Capsolver](https://www.capsolver.com/)
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Capsolvers automatic captcha solver offers the **most affordable and quick captcha-solving solution**. You may rapidly combine it with your program using its simple integration option to achieve the best results in a matter of seconds.
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With a success rate of 99.15%, Capsolver can **answer more than 10M captchas every minute**. This implies that your automation or scrape will have a 99.99% uptime. You may buy a captcha package if you have a large budget.
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At the lowest price on the market, you may receive a variety of solutions, including reCAPTCHA V2, reCAPTCHA V3, hCaptcha, hCaptcha Click, reCaptcha click, Funcaptcha Click, FunCaptcha, datadome captcha, aws captcha, picture-to-text, binance / coinmarketcap captcha, geetest v3 / v3, and more. With this service, **0.1s is the slowest speed ever measured**.
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<details>
2022-04-28 16:01:33 +00:00
<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
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* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks\_live)**.**
* **Share your hacking tricks by submitting PRs to the** [**hacktricks repo**](https://github.com/carlospolop/hacktricks) **and** [**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud).
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</details>