CVE-2026-84673

High

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.

SeverityHigh

CVSS8.8

Exploit probability—

ProductJenkins Customizable Header Plugin

PublishedSep 2, 2026

First seenSep 2, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Vendor advisories

jenkins.io/security/advisory/2026-09-02/#SECURITY-4104

Affected products

Product	Affected versions	Fixed in
Jenkins Project Jenkins Customizable Header Plugin	v ≤ 295.v2544b_ca_19b_97	—

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