Stored Cross-Site Scripting Vulnerability in Jenkins Customizable Header Plugin
CVE-2026-84673

8.8HIGH

Key Information:

Vendor

Jenkins
Status
Jenkins Customizable Header Plugin
Vendor
CVE Published:
2 September 2026

What is CVE-2026-84673?

The Jenkins Customizable Header Plugin version 295.v2544b_ca_19b_97 and prior is vulnerable to a stored cross-site scripting (XSS) attack. This vulnerability arises from improper handling of Stapler data binding, which allows attackers to overwrite the plugin's appearance configuration. By injecting a custom SVG icon that contains inline JavaScript, an attacker could execute arbitrary scripts in the context of a user's session. This could lead to unauthorized actions or data theft, emphasizing the need for timely updates and security patches.

Affected Version(s)

Jenkins Customizable Header Plugin 0 <= 295.v2544b_ca_19b_97

References

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

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.