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What is Cross-site request forgery (CSRF)?

Cross-site request forgery (CSRF) occurs when a malicious website, email, blog, instant message, or program causes a user's web browser to perform an unwanted action on a trusted site where the user is currently authenticated.

These attacks can make use of a target system's normal functions -- such as transferring funds, changing passwords, using the target's browser without the knowledge of the target user.

Mitigation strategies:

  • Do not rely solely on the presence of a valid sessionID or a cookie.
  • Include a unique, single-use value in every response sent to the browser and then validated that token when a request is submitted.
  • Require users to re-authenticate for high-risk transactions.

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