Definition. CSRF (Cross-Site Request Forgery) is an attack that forces authenticated users to send a request to a Web application to which they are already authenticated. CSRF attacks take advantage of a Web application's trust in a logged-in user.
A successful CSRF attack has the potential to be disastrous for both the organisation and the user. Client relationships may be harmed, funds transferred without authorization, passwords changed, and data taken, including session cookies.
In a successful CSRF attack, the attacker makes the victim user accidentally do an action. This could be to update their account's email address, reset their password, or make a money transfer, for example.
CSRF can be avoided by using a hidden field to create a unique token that is transmitted in the body of the HTTP request rather than in the URL, which is more vulnerable to disclosure. To protect against CSRF, the user must be forced to re-authenticate or prove that they are users. Take, for instance, CAPTCHA.
A successful CSRF attack has the potential to be disastrous for both the organisation and the user. Client relationships may be harmed, funds transferred without authorization, passwords changed, and data taken, including session cookies.
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