Stored Cross-Site Scripting Flaw in Jenkins Update-Center2 Affects Plugin Hosting
CVE-2026-84677

5.4MEDIUM

Key Information:

Vendor

Jenkins
Status
Jenkins Update-center2
Vendor
CVE Published:
2 September 2026

What is CVE-2026-84677?

The Jenkins Update-Center2 up to version 3.18.3 is vulnerable to stored cross-site scripting (XSS). This flaw occurs because the system fails to properly escape values provided by plugins, such as plugin names, descriptions, and version metadata, on the plugin download index pages. An attacker can exploit this issue by providing a malicious plugin for hosting, potentially leading to the execution of arbitrary scripts in the context of users viewing the affected pages.

Affected Version(s)

Jenkins update-center2 0 <= 3.18.3

References

https://www.jenkins.io/security/advisory/2026-09-02/#SECU...
vendor-advisory

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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