What’s Vulnerable › Vulnerabilities

CVE-2026-84673

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-03
• Weakness: CWE-79

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.

Affected products

• Jenkins Project Jenkins Customizable Header Plugin: through 295.v2544b_ca_19b_97

References

• https://www.jenkins.io/security/advisory/2026-09-02/#SECURITY-4104

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