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Cross-Site Request Forgery

Definition of Cross-site Request Forgery

Cross-site request forgery (CSRF) is a type of cyberattack where a malicious actor tricks a user into unknowingly performing actions on a web application that they are authenticated to access. These actions can include transferring funds, changing account settings, or even submitting forms, all without the user's consent or awareness. CSRF attacks exploit the trust that a website has in a user's browser by making unauthorized requests on behalf of the user.

The Origin of CSRF Attacks

CSRF attacks have been known to the cybersecurity community since the early 2000s. They emerged as a significant concern alongside the rise of web applications that maintained user state (like logged-in sessions). As web applications grew more complex, maintaining security against such attacks became more challenging. CSRF exploits the trust that a site has in a user's browser, leveraging the fact that the site can’t distinguish between legitimate requests and forged ones.

CSRF in the Real World

A practical example of CSRF could be a scenario where a user logs into their bank's website and, without logging out, visits another site. This other site contains malicious code that triggers a request to the bank's site (like a fund transfer) using the user's credentials. Since the bank's site trusts the user's session, it processes the request, and the action is carried out without the user's consent.

Why Understanding CSRF Matters

While it might seem odd to discuss the 'benefits' of CSRF, understanding this attack is crucial for web developers and businesses. Recognizing the threat posed by CSRF is the first step in developing more secure web applications. It emphasizes the need for robust security protocols and awareness about web application vulnerabilities. By understanding CSRF, developers can implement safeguards like CSRF tokens and ensure that applications can differentiate between legitimate and forged requests, thus protecting users' data and trust.


CSRF is a cyber attack where unauthorized commands are executed on behalf of an authenticated user without their knowledge, exploiting the trust a web application has in the user's browser.

CSRF attacks occur when a malicious website sends a request to a web application where the user is authenticated, using the user's credentials to perform unauthorized actions.

Yes, CSRF can be prevented by implementing security measures like using CSRF tokens in web applications, which ensure that each request is authorized by the user.


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