¿Qué significa token antifalsificación no válido?

What does invalid anti-forgery token mean?

Anti-forgery token is used to prevent CSRF (Cross-Site Request Forgery) attacks. In the next client request, the server expects to see this token. If the token is missing or it is different, then the server rejects the request (Reference)

In general, the anti-forgery-token is an HTML hidden input that that’s rendered for you to avoid CSRF attacks. Broadly, it works by comparing the value that the server sent down to the client to what the client sends back on the post.

Anti-forgery token validation is enabled by default in Razor Pages. You can disable validation either globally or on individual pages by using [IgnoreAntiforgeryToken] . You can prevent forms from creating anti-forgery tokens by using asp-antiforgery=”false” in the form tag helper.

Anti-Forgery Tokens

• The client requests an HTML page that contains a form.
• The server includes two tokens in the response. One token is sent as a cookie.
• When the client submits the form, it must send both tokens back to the server.
• If a request does not include both tokens, the server disallows the request.

This is to prevent Cross-site request forgery in your MVC application. This is part of the OWASP Top 10 and it is vital in terms of web security. Using the @Html. AntiforgeryToken() method will generate a token per every request so then no one can forge a form post.

CSRF (Cross site request forgery) is a method of attacking a website where the attacker imitates a.k.a forges as a trusted source and sends data to the site. CSRF is a method of attacking a website where the attacker imitates a.k.a forges as a trusted source and sends data to the site.

And here is the error I get: A required anti-forgery token was not supplied or was invalid. I’ve read that changing users on the HttpContext will invalidate the token, but this isn’t happening here. The HttpGet on my Join action just returns the view:

The provided anti-forgery token was meant for user “”, but the current user is “X”. The anti-forgery cookie token and form field token do not match. The required anti-forgery cookie “__RequestVerificationToken” is not present.

IIS server associates this token with current user’s identity before sending it to the client These are some of the anti-forgery token related error messages you may see in Event Viewer: The provided anti-forgery token was meant for a different claims-based user than the current user.

Long story short: For anti-forgery validation to pass, the security token of the session token must be equal to the security token of the field token. I saw different names for these cookies in different sources.

To help prevent CSRF attacks, ASP.NET MVC uses anti-forgery tokens, also called request verification tokens. The client requests an HTML page that contains a form. The server includes two tokens in the response. One token is sent as a cookie.

ASP.NET Core uses a hidden field to store the anti-forgery token and uses the ValidateAntiForgeryToken attribute to validate the token. As the token is sent to the browser in a hidden field, it is also stored in an HttpOnly cookie.

ValidateAntiForgeryToken is an action filter that can be applied to an individual action, a controller, or globally. Requests made to actions that have this filter applied are blocked unless the request includes a valid antiforgery token.

A great feature in ASP.NET MVC is the AntiForgeryToken. This Generates a hidden form field (anti-forgery token) that is validated when the form is submitted. The anti-forgery token can be used to help protect your application against cross-site request forgery.

everyone involved in building the web application must be aware of the risks associated with CSRF vulnerabilities.

Anti-CSRF tokens are randomly generated “challenge” tokens that are associated with the user’s current session. They are inserted within HTML forms and links associated with sensitive server-side operations.

Anti-forgery stands for “Act of copying or imitating things like a signature on a cheque, an official document to deceive the authority source for financial gains”.