CVE-2026-84677 Cross-site scripting in Jenkins update-center2
Stored XSS in Jenkins update center allows attackers to inject scripts via plugin metadata, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-84677?
CVE-2026-84677 is a medium-severity cross-site scripting vulnerability in Jenkins update-center2, published on 2 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-84677?
How do I fix CVE-2026-84677?
No fix has been published for CVE-2026-84677 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-84677 being exploited?
There is no known exploitation of CVE-2026-84677 in the wild and no public exploit code.
Sources
Also known as GHSA-m2jq-fx7h-7hr9.