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Is a JWT a CSRF token?
To mitigate the known issues of this technique, the CSRF token is stored in a JWT. Additionally, the account identifier is included in this JWT as well for logged-in users. Storing the CSRF token in a JWT makes it possible for the back-end application to verify that it produced the token itself.
Is JWT token valid?
JWT tokens are digitally signed (the signature part) using the payload content and a secret key. In order to change the content, the secret key is required to generate the signature again, otherwise, the signature will be invalid. In order to validate a JWT, you must know the content of JWT.
Why are JWT tokens vulnerable to CSRF attacks?
JWT tokens are popular since they are used as the default token format in new authorization and authentication protocols like OAuth 2.0 and OpenID Connect. When the token is stored in a cookie, the browser will automatically send it along with each request to the same domain and this is still vulnerable to CSRF attacks.
How to secure JWT authentication against both XSS and XSRF?
By using a csrf token. This token will be required by the backend in order to validate any request. As explained before, in an XSRF attack, the JWT token cookie we had set will be attached, partially validating the request. Now, to complete the validation, we need something that can not be accessed in an XSRF.
Where to store JWT in browser, how to protect against CSRF?
If the JWT is stored in localStorage/sessionStorage, then there is no cookie involved so don’t need to protect against CRSF. The question is how to send the JWT to the server. I found herethat it is suggested to use jQuery to send the JWT by HTTP header of ajax requests.
Can a secure JWT token be read from JavaScript?
Secure and HttpOnly cookies can not be read from JavaScript, and can only be transported through https, so that the content can not be sniffed. Therefore, we will use this kind of cookies to store the JWT token. That way, in case of XSS, the JWT token can not be read by the malicious script.