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CSRF (Cross-Site Request Forgery) | Glossary

CSRF (Cross-Site Request Forgery) is an attack where a malicious website tricks an authenticated user into unknowingly submitting a request to another site — for example, transferring funds or changing account settings — by exploiting the browser's automatic inclusion of session cookies.

Why it matters: CSRF can silently perform destructive actions on behalf of a victim using their existing authenticated session, without them ever knowing.

Quick tips:

Use CSRF tokens — unique, unpredictable values attached to forms and validated server-side on each submission.
Set cookies with SameSite=Strict or SameSite=Lax to block cross-origin cookie sending in most cases.
Validate the Origin or Referer header on all state-changing requests as a secondary check.