What is CSRF and how do you handle it?

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CSRF (Cross-Site Request Forgery) is a type of web security vulnerability where an attacker tricks an authenticated user into unintentionally performing actions on a trusted website without their consent. For example, if a user is logged into a banking app, a malicious site could secretly send a request to transfer money using the user’s active session cookies. Since the request comes from the victim’s browser, the server may treat it as valid.

Handling CSRF involves implementing defenses that ensure requests are intentional and come from the legitimate source:

1. CSRF Tokens – The server generates a unique, unpredictable token for each session or request. This token is embedded in forms or headers and validated by the server. Attackers cannot guess or reuse it.

   • In Spring Security, CSRF protection is enabled by default. The token is added as a hidden field in forms or via headers like X-CSRF-TOKEN.

2. SameSite Cookies – Mark cookies with SameSite=strict or lax to prevent browsers from sending them on cross-site requests.

3. Custom Headers – APIs can require special headers (e.g., X-Requested-With) that are not automatically added by malicious sites.

4. Re-authentication – For critical actions (like money transfers), require password or OTP confirmation.

Summary: CSRF exploits trust between the user and server. Using CSRF tokens, secure cookie settings, and additional verification helps ensure requests are legitimate and protect applications effectively.

Read more  :

How do you configure basic authentication?

What is Spring Security?

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