alt Hacker NewsAFAIK not all NFC-enabled passports support Active Authentication. E.g least before US passports did not support it so cloning them is as easy as reading them via NFC.
So you cant fake non-existing passport because of issuer signature, but cloning is not a rocket science for many countries passports.
Nowadays, for US passports (I don't know about other countries), the number/key needed to let the chip talk to you is printed on the photo page, so the older way of reading the NFC from afar won't work without that number.