Ghost versions 1.18.0 before 6.27.0 contain a server-side request forgery vulnerability in the webhooks feature that allows staff users to probe internal hosts. Attackers with staff privileges can craft webhook requests to access internal network resources from the Ghost server.
Weakness
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.