The GitHub Actions Attack Diagram is a visual reference guide that maps out attack vectors and exploitation techniques targeting GitHub Actions configurations and CI/CD pipelines. The diagram illustrates multiple attack paths that can be initiated from different access levels, including read-only or write access to GitHub organizations or repositories. It covers three primary attack vectors: self-hosted runner takeover, PWN requests, and secrets exfiltration. The tool serves as an educational resource for security professionals to understand potential vulnerabilities in GitHub Actions workflows. It is based on findings from real-world red team engagements and public vulnerability research, focusing on proven Tactics, Techniques, and Procedures (TTPs) that have been successfully demonstrated in live environments. The diagram includes references to additional research materials, presentations, and blog posts that provide detailed context about CI/CD security vulnerabilities and exploitation methods. While not comprehensive, it highlights major attack paths that security teams should consider when assessing GitHub Actions implementations.