CVE-2026-84677
Received Received - Intake

Stored XSS in Jenkins Update Center Plugin

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: Jenkins Project

Description
Jenkins update-center2 3.18.3 and earlier does not escape plugin-provided values (plugin names, descriptions, and version metadata) on plugin download index pages, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to provide a plugin for hosting.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-02
AI Q&A
2026-09-02
EPSS Evaluated
N/A
NVD
CVE-2026-84677
EUVD
EUVD-2026-70150

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
jenkins jenkins to 3.18.3 (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 update-center2 versions 3.18.3 and earlier have a stored cross-site scripting (XSS) vulnerability. Attackers who can provide a plugin for hosting can inject malicious scripts into plugin names, descriptions, or version metadata. These values are not properly escaped when displayed on plugin download index pages, allowing the scripts to be stored and executed in users' browsers.

Impact Analysis

This vulnerability could allow attackers to steal user session cookies, perform actions on behalf of users, or redirect users to malicious websites. Users downloading or viewing plugins from the affected Jenkins update-center2 could unknowingly execute malicious scripts in their browsers.

Mitigation Strategies

Upgrade Jenkins update-center2 to version 3.18.4 or later to address the stored XSS vulnerability. Review plugins for suspicious content and remove any untrusted plugins.

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