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GitHub Actions Security: The Boring Settings That Prevent the Next Supply-Chain Incident

Tighten defaults: read-only GITHUB_TOKEN, pin actions, restrict triggers, and use env protection rules.

5 min read Updated 2025

Hardening CI pays off: lock down permissions, pin actions, avoid untrusted inputs, and gate deployments.

Quick checklist
  • permissions: read-all by default
  • pin third-party actions
  • restrict workflow_dispatch inputs
  • env protection + reviewers

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