Actions are automated workflows that run tasks such as tests, builds, scans, deployments, or policy checks. In platforms like GitHub, they help teams turn code events, such as a push or pull request, into repeatable machine-driven steps.
In cyber security, Actions matter because they often sit inside the software supply chain. They can enforce security controls by running dependency checks, linting, signed-build verification, or secret detection before code is merged. But they are also a target: attackers may try to abuse workflow configuration, steal secrets from a job, or insert malicious steps into a trusted pipeline. When Actions become unavailable, teams may lose automated validation and be forced into manual fallback processes, which can slow releases and increase the chance of mistakes. Secure use of Actions depends on least-privilege permissions, reviewed workflow files, pinned dependencies, and careful handling of credentials.