A site security issue or security vulnerability is something like a hack or exploit on YouTube. It doesn’t include harassment or other violations of our Terms of Service.
If you think you've found a security issue or vulnerability on the YouTube site, tell us about it here. We need to know the exact URL of a sample page, if possible. We’d also appreciate it if you could include a detailed description of the issue. Be sure to use an email address where we can reach you if we need more information.