McAfee discovered a bug in Windows 10 that let hackers use Cortana to gain access to locked computers. The exploit is related to how Windows 10 is constantly indexing data on your computer. Microsoft has already patched the exploit with a security update that was released on June 12. Any hackers trying to mess with your system would need to have direct access to your PC, as the exploit isn’t something that can be done online. If youre really concerned, you can also disable Cortana from responding while your PC is locked.”]
Source: https://gizmodo.com/update-your-pc-now-to-fix-this-pesky-cortana-security-f-1826793381