The possibility of a skimmer or data modifier.
Ie, I add a logger to your sensor, get all of your data, then make a sensor that translates my fingerprint to look like your fingerprint (or just always sends your fingerprint)
Ie, I add a logger to your sensor, get all of your data, then make a sensor that translates my fingerprint to look like your fingerprint (or just always sends your fingerprint)
Touch ID has been proven to be vulnerable to fingerprint clones for years.
https://www.youtube.com/watch?v=HM8b8d8kSNQ
Edit: Yes, not broken but also not 100% secure.