CSRF Protection Guide: Tokens and SameSite Cookies
How cross-site request forgery works, why SameSite=Strict cookies block it, and when CSRF tokens are still needed for full protection.
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Tags: security, web, csrf
CSRF Protection: CSRF Tokens, SameSite Cookies, and Double Submit Cross-Site Request Forgery (CSRF) tricks a victim's browser into making an authenticated request to your application on behalf of an attacker. The victim does not know they made the request. The server cannot distinguish it from a legitimate request because the browser automatically includes the session cookie. The result: the attacker can execute actions as the victim — transfer money, change email addresses, delete accounts. How CSRF Works A victim is logged into . While keeping that tab open, they visit , which contains: The browser loads the image URL by making a GET request to . Because the victim is logged in, the browser automatically includes the session cookie. The bank's server receives a valid authenticated…
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