CVE-2026-84673Network attack vectorHinoki check available

Stored XSS via bindable SVG appearance configuration

Published Sep 2, 2026 · Updated Sep 2, 2026

Stored XSS in Jenkins Customizable Header Plugin 295.v2544b_ca_19b_97 and earlier allows remote authenticated users to run JavaScript. A global-configuration constructor remains annotated with @DataBoundConstructor, so Stapler reaches @DataBoundSetter methods and accepts an SVG logo with inline script. A low-privileged account able to submit the affected forms is required; the stored script executes in Jenkins pages that render the customized header.

CVSS severity8.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Jenkins Customizable Header Plugin 295.v2544b_ca_19b_97 and earlier allows remote authenticated users to run JavaScript. A global-configuration constructor remains annotated with @DataBoundConstructor, so Stapler reaches @DataBoundSetter methods and accepts an SVG logo with inline script. A low-privileged account able to submit the affected forms is required; the stored script executes in Jenkins pages that render the customized header.

The record

CVE
CVE-2026-84673
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
Jenkins Project
Product
Customizable Header Plugin
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=295.v2544b_ca_19b_97

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · Customizable Header Pluginversion=0 <=295.v2544b_ca_19b_97

Published CVSS scores

8.8CISA ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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