This guide outlines how to secure Jenkins CI/CD environments by reducing attack surface and enforcing strict access controls. It emphasizes isolating Jenkins using containers, running agents with minimal privileges, and enforcing immutable, patched build images. Strong authentication via SSO, MFA, and RBAC is critical to control access. It also recommends network segmentation, disabling insecure interfaces, and scanning plugins and dependencies for vulnerabilities. Continuous monitoring, audit logging, and SIEM integration are highlighted for detection and response. The takeaway is that Jenkins must be hardened as critical infrastructure, with layered controls across compute, identity, and pipelines.

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