CVE-2026-84673
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Stored XSS in Jenkins Customizable Header Plugin

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: Jenkins Project

Description
Jenkins Customizable Header Plugin 295.v2544b_ca_19b_97 and earlier allows overwriting the plugin's appearance configuration through Stapler data binding, allowing attackers to configure a custom SVG icon containing inline JavaScript, resulting in a stored cross-site scripting (XSS) vulnerability.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-23
AI Q&A
2026-09-02
EPSS Evaluated
2026-09-21
NVD
CVE-2026-84673
EUVD
EUVD-2026-70146

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
jenkinsci customizable_header_plugin to 295.v2544b_ca_19b_97 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

Jenkins Customizable Header Plugin versions 295.v2544b_ca_19b_97 and earlier have a stored cross-site scripting (XSS) vulnerability. Attackers can exploit Stapler data binding to overwrite the plugin's appearance configuration and inject a custom SVG icon containing inline JavaScript.

Detection Guidance

This vulnerability is specific to Jenkins Customizable Header Plugin. To detect it, check if the plugin version is 295.v2544b_ca_19b_97 or earlier. Inspect the plugin's configuration for unauthorized SVG icons with inline JavaScript in the appearance settings.

Impact Analysis

This vulnerability allows attackers to execute malicious JavaScript in the context of a user's browser session. This could lead to unauthorized actions, data theft, or session hijacking if a user interacts with the compromised plugin configuration.

Compliance Impact

This XSS vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Update Jenkins Customizable Header Plugin to version 295.v2544b_ca_19b_97 or later to address the XSS vulnerability. Disable the plugin if not in use and monitor for suspicious activity in Jenkins logs.

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