GitHub is not just a source code platform anymore.
For most engineering organizations, GitHub is part identity system, part software supply chain, part CI/CD platform, part secret store, part deployment orchestrator, and part production change-control system.
That means we should secure GitHub like a production control plane.
This guide is written from the perspective of a CISO tightening GitHub across an organization. It is not a high-level best-practice list. It is a practical hardening baseline we can apply, audit, and improve over time.
The goal is simple:
