Jenkins Update-2 XSS via Unescaped Plugin Metadata (3.18.3)
CVE-2026-84677 Published on September 2, 2026
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 Analysis
CVE-2026-84677 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-84677 has been classified to as a XSS vulnerability or weakness.
Affected Versions
Jenkins Project Jenkins update-center2:- Before and including 3.18.3 is affected.