Jenkins Customizable Header Plugin XSS via Stapler Data Binding
CVE-2026-84673 Published on September 2, 2026

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.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-84673 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a XSS Vulnerability?

The software 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.

CVE-2026-84673 has been classified to as a XSS vulnerability or weakness.


Products Associated with CVE-2026-84673

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Jenkins
 

Affected Versions

Jenkins Project Jenkins Customizable Header Plugin: