Twitch recently experienced a security breach where 6,000 internal git repositories and 3,000,000 documents were exposed on 4chan. This incident highlights the issue of excessive permissions to Source Code Management tools. The text discusses best practices to avoid source code leaks, including proper management of access levels and permissions in GitHub or similar platforms. It also outlines three ways an adversary can exploit access to source code: through a developer's workstation, by leveraging the browser's context, or by obtaining an access token.