https://securitytxt.org/
TL;DR: security.txt for reporting security issues, like robots.txt for telling web robots how to behave.
Example file:
# Our security address
Contact: [email protected]
# Our PGP key
Encryption: https://example.com/pgp-key.txt
This would make it much easier for people to discover how to report things (99% of the time you can plug a product name in and get the web page no problem, then the problem becomes finding the contact details for reporting your security vulnerability).
Emailing board as well to start discussion.