I found security vulnerability/bug on YouTube. I want to report. How can I report it? Is there a quick way?
Being that YouTube is a product of Google, You can report the bug on Google's report security bug, page
From the page:
If you have found a security bug in a Google product and want to report it to us, you've come to the right place. Please fill out the following form and we'll be in touch shortly. If this is a valid vulnerability report, it might also be eligible for a reward as part of our Vulnerability Reward Program. Thanks!