CVE-2026-84645

Analyzed Analyzed - Analysis Complete

Remote Code Execution in Jenkins via Stapler Request Handling

Publication date: 2026-09-02

Last updated on: 2026-09-11

Assigner: Jenkins Project

Description

In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, objects of types marked as storing their configuration in independent top-level configuration files in Jenkins (such as the global configuration and jobs) can appear as nested field values in user-submitted `config.xml` documents and subsequently handle HTTP requests via Stapler, resulting in remote code execution.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-02

Last Modified

2026-09-11

Generated

2026-09-15

AI Q&A

2026-09-02

EPSS Evaluated

2026-09-14

NVD

CVE-2026-84645

EUVD

EUVD-2026-70111

Affected Vendors & Products

Vendor	Product	Version / Range
jenkins	jenkins	to 2.580 (exc)
jenkins	jenkins	to 2.568.3 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-94	The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
CWE-915	The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.

Attack-Flow Graph

Executive Summary

CVE-2026-84645 is a deserialization vulnerability in Jenkins where user-submitted config.xml files could embed serialized objects marked for independent configuration storage. When processed via Stapler's HTTP request handling, this allowed attackers to access the Script Console and execute remote code.

Detection Guidance

Check Jenkins version with 'java -jar jenkins.war --version' or via the web UI at /systemInfo. If running 2.579 or earlier (LTS 2.568.2 or earlier), the system is vulnerable. Inspect config.xml files for suspicious nested objects or deserialization patterns.

Impact Analysis

An attacker could exploit this to gain remote code execution on a Jenkins server, potentially taking control of the system, accessing sensitive data, or disrupting operations. This requires user-submitted config.xml files to be processed by the vulnerable Jenkins version.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations using vulnerable Jenkins versions may face compliance violations and legal consequences.

Mitigation Strategies

Upgrade Jenkins to version 2.580 or later (LTS 2.568.3 or later) immediately. Disable user-submitted config.xml processing if possible and review Script Console access logs for unauthorized activity.

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