Whenever a website finds cookies, it automatically initiates the action in the cookie’s request. Online criminals can program malicious websites to initiate negative actions—like deleting files—when they find cookies from another reputable website.
With a little help of social engineering (such as sending a link via email or chat), an attacker may trick the users of a web application into executing actions of the attacker’s choosing.
If the victim is a normal user, a successful CSRF attack can force the user to perform state changing requests like transferring funds, changing their email address, and so forth. If the victim is an administrative account, CSRF can compromise the entire web application.