How does CSRF protection work in Flask-WTF forms?

How does CSRF protection work in Flask-WTF forms?

CSRF protection in Flask-WTF forms is implemented using a hidden token that is included in the form. This token is unique to each session and helps to verify that the form submission is coming from the authenticated user.

What happens if the CSRF token is missing or invalid?

If the CSRF token is missing or invalid, Flask-WTF will reject the form submission and typically return a 400 Bad Request error, preventing potential CSRF attacks.

How do I enable CSRF protection in my Flask app?

To enable CSRF protection, you need to initialize the CSRF extension in your Flask app and ensure that your forms include the CSRF token. You can do this by using csrf_token() in your form templates.

Can I customize the error message for CSRF validation failures?

Yes, you can customize the error message by overriding the default error handling in your Flask app. You can catch the CSRF error and return a custom response.