The Script Security Plugin is a Jenkins component that reviews and approves user-supplied scripts before they execute. It is designed to keep Groovy and other embedded logic inside a sandbox until an administrator or trusted policy allows broader permissions. In practice, it helps separate untrusted pipeline code from the Jenkins controller, where secrets, build configuration, and plugin logic are concentrated.
This matters because script approval is a trust boundary. If the plugin or its surrounding policy is bypassed, an attacker may turn a limited script into controller-side code execution, read credentials, or manipulate jobs and files. Defenders use it to enforce least privilege, reduce the risk of sandbox escapes, and make script execution auditable. In real environments, security teams should restrict who can submit scripts, review approvals carefully, and patch the plugin quickly because flaws here can affect the whole CI/CD control plane.