Here is the full CDC order.
https://www.cdc.gov/quarantine/pdf/CDC-Conditional-Sail-Order_10_30_2020-p.pdf
Starting at the bottom of page 31 is where the minimum standards start:
The cruise ship operator must in marketing materials, on its website, and in offerings for voyages, notify prospective passengers prior to accepting a reservation of any CDC travel advisory, warning, or recommendation relating to cruise travel.
Such notification must further advise prospective passengers that, if a threshold of COVID-19 is detected on board the cruise ship during a voyage, the voyage will be ended immediately and the ship returned to the U.S. port of embarkation, and their subsequent travel, including their return home, may be restricted or delayed.