Cross-site request forgery (CSRF) vulnerability in system_firmware_restorefullbackup.php in the WebGUI in pfSense before 2.2.1 allows remote attackers to hijack the authentication of administrators for requests that delete arbitrary files via the deletefile parameter.
Cross-Site Request Forgery The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.