Do not open a public issue for a security problem.
Report it through GitHub's private vulnerability reporting, or by email to contact@iq2i.com. You will get an acknowledgement within a few working days.
This repository holds reusable workflows and composite actions. The problems that matter most here are the ones that could compromise a repository that calls them: an unpinned or hijackable third-party action, a script that interpolates untrusted input into a shell command, or a workflow requesting more permissions than it needs.
For a vulnerability in one of the applications or libraries that consume these workflows, report it on that repository instead.