CVE-2026-84677 — MEDIUM (5.4)

Vulnerability Description

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.

CVSS Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Related Weaknesses (CWE)

CWE-79

References

https://www.jenkins.io/security/advisory/2026-09-02/#SECURITY-4038

FAQ

What is CVE-2026-84677?

CVE-2026-84677 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 scr...

How severe is CVE-2026-84677?

CVE-2026-84677 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-84677?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.