Using this table for reference and the fact that proper smartcards like banking cards and SIM cards are secure I'm pretty confident calling modern CA systems secure too. If some providers don't have one of those, then it's probably because it's not worth it for them to switch or upgrade.
https://en.wikipedia.org/wiki/Conditional_access#Digital_sys...
EDIT: More than that, some recent ones even solved so called 'card sharing' which is basically using a legitimate card to transmit control words over network to many users.