Hey, I run a private bug bounty program on HackerOne and we get those emails regularly, most of the times they did not find anything serious and they are just c

Hey, I run a private bug bounty program on HackerOne and we get those emails regularly, most of the times they did not find anything serious and they are just checking if you have one to see if they should invest time in it. With a new startup and nobody looking at it they are more likely to find something :) You should just be honest and tell send to the details to security@youcompany.com you can also create a private program on one of the bug bounty plateform and invite them, they will get reputation/kudos if they find something.