What is CSRF protection?
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CSRF (Cross-Site Request Forgery) protection is a security measure that prevents unauthorized commands from being transmitted from a user that the web application trusts. Essentially, CSRF attacks trick a logged-in user’s browser into submitting malicious requests (like changing a password or making a transaction) without their consent.
How CSRF works:
An attacker crafts a malicious webpage or email containing a request to the target site where the user is authenticated. When the user visits the attacker’s page, their browser unknowingly sends the forged request, exploiting their active session.
CSRF Protection Mechanism:
To defend against this, web applications implement CSRF tokens—unique, unpredictable values generated by the server and embedded in each form or request that modifies state (POST, PUT, DELETE). When a request is submitted, the server verifies that the token matches the one issued to the user’s session. If the token is missing or invalid, the request is rejected.
In Django:
Django includes built-in CSRF protection middleware. It automatically generates and verifies CSRF tokens in forms and AJAX requests. You use the {% csrf_token %} template tag inside forms, and Django validates the token on each POST request.
Summary:
CSRF protection ensures that state-changing requests come from legitimate sources, not from attackers exploiting authenticated users. It’s a critical layer of web security to prevent unauthorized actions performed via trusted user sessions.
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