CVE-2026-84664
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Jenkins GitLab Plugin GitLab Connection Configuration Overwrite

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: Jenkins Project

Description
Jenkins GitLab Plugin 1.9.16 and earlier allows overwriting the global GitLab connection configuration through Stapler data binding, allowing attackers to connect to an attacker-specified URL using GitLab API tokens already configured by administrators.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-10
AI Q&A
2026-09-02
EPSS Evaluated
2026-09-09
NVD
CVE-2026-84664
EUVD
EUVD-2026-70130

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
jenkinsci gitlab_plugin to 1.9.17 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-494 The product downloads source code or an executable from a remote location and executes the code without sufficiently verifying the origin and integrity of the code.
CWE-471 The product does not properly protect an assumed-immutable element from being modified by an attacker.

Attack-Flow Graph

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Executive Summary

Jenkins GitLab Plugin versions 1.9.16 and earlier are vulnerable to improper input validation. Attackers can exploit Stapler data binding to overwrite the global GitLab connection configuration. This allows them to redirect GitLab API calls to a malicious URL while using legitimate API tokens already configured by administrators.

Detection Guidance

To detect this vulnerability, inspect Jenkins configurations for unauthorized GitLab connection changes. Check the global GitLab plugin settings for unexpected URL modifications or API token usage. Review logs for unusual GitLab API interactions or configuration updates.

Impact Analysis

This vulnerability could allow attackers to exfiltrate data or perform unauthorized actions by intercepting GitLab API communications. Sensitive project data, credentials, or tokens may be exposed if the malicious URL captures or relays requests to the real GitLab server.

Compliance Impact

This vulnerability may lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA requirements for data protection and access controls. Organizations could face compliance violations if data breaches occur due to this misconfiguration.

Mitigation Strategies

Update Jenkins GitLab Plugin to version 1.9.17 or later to address the Stapler data binding issue. Review and audit GitLab connection configurations for unauthorized changes.

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