This project is a user stylesheet, so security should not be a concern. Nevertheless, you should never say "never" in IT.

The latest version of the user stylesheet is the version being supported with potential security updates.

To report a vulnerability or security issue:

1. Click on the Security tab at the top of the project page on GitHub.
2. Click on the Report a Vulnerability button in the top right corner of the page to write a draft "Security Advisory".
   1. Draft Security Advisory are only visible to the project maintainers aka me, Nyx Midnight.
3. I will try my best to get back to you within 48 hours. Please keep in mind that this is a hobby project and that I have a non-IT day job to keep up with.
4. If the security advisory does apply to this project, I will do my absolute best to get it either fixed (or mitigated if not fixable) within a week.
5. If the security advisory applies to this project, I will publish it publicly on the repository.

GitHub has a documentation section on Best practices for writing repository security advisories

Thank you.