CI/CD Security Best Practices: A 2026 Checklist | Harness Blog

CI/CD pipelines are high-value security targets because they centralize credentials, signing keys, artifact access, and deployment permissions across multiple environments, meaning a compromise can affect everything they deploy. The checklist emphasizes managed runtime-injected secrets, least-privilege RBAC, isolated runners, pinned and scanned dependencies, SBOM generation, signed and verified artifacts, and centralized audit evidence, while warning that hardcoded credentials, broad IAM roles, mutable third-party action tags, and unreviewed pipeline definitions are common weaknesses. It recommends implementing controls progressively through report-only visibility, warning-mode policy, and narrowly targeted enforcement to avoid unnecessarily disrupting development teams. The article also argues that increased use of AI coding tools and third-party dependencies expands pipeline risk, citing incidents involving compromised action versions as examples of supply-chain exposure. Harness presents its governed pipeline approach, security-testing orchestration, policy-as-code, provenance features, and centralized auditing as tools for applying these practices consistently, with customer examples from Deluxe and Citi illustrating standardized security controls at scale.

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