GitGuardian has uncovered GhostAction, a massive supply chain attack targeting 327 GitHub users and 817 repositories. Attackers injected malicious workflows that exfiltrated over 3,325 secrets, including npm, PyPI, and DockerHub tokens. Watch as GitGuardian's Senior Cybersecurity Researcher, Guillaume Valadon breaks down how this campaign unfolded, what was stolen, and what developers need to know to stay safe.