Cross site request forgery

Definition
Cross site request forgery is

"a type of malicious exploit where an attacker gains access to and executes unauthorized commands on a target web application (e.g., web interface for a network device or web email client) via the browser of an already authenticated user. The attack is accomplished by tricking a validated user who has logged in and has a session cookie stored in the browser into opening an email message or visiting a webpage with imbedded malicious content."