Is CVE-2026-84673 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-84673?

CVE-2026-84673 has a CVSS v3 severity of HIGH (8.8).

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CVE-2026-84673

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.