Scripts not permitted to use method CI/CD Origin: Build & delivery Last updated 25 Oct 2026

Jenkins: org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: Scripts not permitted to use method java.lang.String toUpperCase

A sandboxed Pipeline script called a method that has not been approved in Script Security.

Exact message you may see Scripts not permitted to use methodScripts not permitted to use newScripts not permitted to use staticMethod
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Seen on: Jenkins

Meaning

Pipeline scripts run in a Groovy sandbox for safety. Unapproved methods are blocked until an administrator approves the signature at Manage Jenkins → In-process Script Approval. Safer fix: move the logic into a shared library (trusted) or use built-in steps.

Common causes

  • Using Java/Groovy APIs not whitelisted in the sandbox
  • Calling methods on arbitrary objects (e.g. new File())
  • New signature after a plugin update
  • Script uses @NonCPS or reflection
  • Shared library marked untrusted

⚡ Quick fix

  1. Approve the signature in Manage Jenkins → In-process Script Approval (review it first)
  2. Move logic into a trusted shared library
  3. Replace with pipeline steps (readJSON, sh)

Detailed fix by platform

Jenkins

  1. Use readJSON/writeFile steps instead of Java IO
  2. Review requests carefully — approval grants that call to all sandboxed scripts

How to diagnose

  1. Method — Which signature is rejected?
  2. Alternative — Is a Pipeline step available?
  3. Trust — Safe to approve?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Build & delivery. Errors that are often confused with or caused by this one (click to open):

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