8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2020-2109

CVE-2020-2109: Improper Input Validation in Jenkins Pipeline: Groovy Plugin

Sandbox protection in Jenkins Pipeline: Groovy Plugin 2.78 and earlier can be circumvented through default parameter expressions in CPS-transformed methods.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2020-2109

CVE-2020-2109:

8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
org.jenkins-ci.plugins.workflow:workflow-cps	maven	<= 2.78	2.79

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from improper handling of default parameter expressions in CPS-transformed methods. The commit 41cb4e0 introduced the InitialExpressionExpander to generate overloaded methods and process initial parameter expressions. Before this fix, these expressions were not subjected to CPS transformation and sandbox checks. The visitMethod function in CpsTransformer.java was responsible for method transformation but lacked this critical expansion step, allowing sandbox bypass via default parameter values. The added test cases in CpsTransformer2Test.java and SandboxInvoker2Test.java confirm that default parameter expressions were previously not properly intercepted.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

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WAF Protection Rules

WAF Rule

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Reasoning

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