What is CVE-2026-84677?

CVE-2026-84677 is a medium-severity vulnerability in Jenkins Project Update-Center2, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-09-02.

How severe is CVE-2026-84677?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Jenkins Project Update-Center2

CVE-2026-84677

Jenkins update-center2 3.18.3 and earlier does not escape plugin-provided values (plugin names, descriptions, and version metadata) on plugin download index pages, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to provide a plugin for hosting.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Jenkins Project Update-center2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

jenkinsci-cert@googlegroups.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-84677?: CVE-2026-84677 is a medium-severity vulnerability in Jenkins Project Update-Center2, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-09-02.
How severe is CVE-2026-84677?: Medium severity. CVSS v3 base score is 5.4 out of 10.