Ghost through 5.85.1 allows remote attackers to bypass an authentication rate-limit protection mechanism by using many X-Forwarded-For headers with different values. NOTE: the vendors position is that Ghost should be installed with a reverse proxy that allows only trusted X-Forwarded-For headers.
The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct.
Attackers may be able to bypass weak authentication faster and/or with less effort than expected.