CVE-2026-84677: Vulnerability in Jenkins Project Jenkins update-center2
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 v3.1
Score 5.4medium
Affected software
Jenkins Project
Jenkins update-center2
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-84677 is a stored XSS vulnerability in Jenkins update-center2 (version 3.18.3 and earlier) caused by failure to escape plugin-provided values such as plugin names, descriptions, and version metadata on plugin download index pages. This flaw enables attackers able to supply a plugin for hosting to inject malicious scripts that persist on the page and execute when viewed by other users.
Potential Impact
Successful exploitation can lead to limited confidentiality and integrity impacts via script execution in the context of users viewing the affected pages. The CVSS score of 5.4 reflects a medium severity with network attack vector, low attack complexity, requiring low privileges and user interaction, and partial impact on confidentiality and integrity but no impact on availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Users should monitor Jenkins advisories for updates addressing this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- jenkins
- Date Reserved
- 2026-09-01T21:55:27.036Z
- State
- PUBLISHED
Threat ID: 6a984667acd9273b496cc566
Added to database: 09/02/2026, 15:53:11 UTC
Last enriched: 09/07/2026, 13:40:43 UTC
Last updated: 10/16/2026, 06:48:19 UTC
Views: 76
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.