An attack in which a subscriber currently authenticated to an RP and connected through a secure session browses to an attacker’s website, causing the subscriber to unknowingly invoke unwanted actions at the RP.
For example, if a bank website is vulnerable to a CSRF attack, it may be possible for a subscriber to unintentionally authorize a large money transfer, merely by viewing a malicious link in a webmail message while a connection to the bank is open in another browser window.
NIST SP 800-63-3
A type of Web exploit where an unauthorized party causes commands to be transmitted by a trusted user of a Web site without that user’s knowledge.
NISTIR 7711 under Cross-Site Request Forgery