CVE-2026-84673

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.

  • Published Sep 2, 2026
  • CVSS 8.8 high
  • 0.5% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-84673 at the National Vulnerability Database