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Message-Id: <7CE8AD96-CC7D-4973-9C69-9558DC2D18D7@beckweb.net>
Date: Wed, 18 Feb 2026 15:04:04 +0100
From: Daniel Beck <ml@...kweb.net>
To: oss-security@...ts.openwall.com
Subject: Multiple vulnerabilities in Jenkins
Jenkins is an open source automation server which enables developers around
the world to reliably build, test, and deploy their software.
The following releases contain fixes for security vulnerabilities:
* Jenkins 2.551
* Jenkins LTS 2.541.2
Summaries of the vulnerabilities are below. More details, severity, and
attribution can be found here:
https://www.jenkins.io/security/advisory/2026-02-18/
We provide advance notification for security updates on this mailing list:
https://groups.google.com/d/forum/jenkinsci-advisories
If you discover security vulnerabilities in Jenkins, please report them as
described here:
https://www.jenkins.io/security/#reporting-vulnerabilities
---
SECURITY-3669 / CVE-2026-27099
Since Jenkins 2.483, the description of the reason why a node is offline
(the "offline cause") is defined as containing HTML and rendered as such.
Jenkins 2.550 and earlier, LTS 2.541.1 and earlier does not escape the
user-provided description of the "Mark temporarily offline" offline cause.
This results in a stored cross-site scripting (XSS) vulnerability
exploitable by attackers with Agent/Configure or Agent/Disconnect
permission.
SECURITY-3658 / CVE-2026-27100
Jenkins 2.550 and earlier, LTS 2.541.1 and earlier accepts Run Parameter
values that refer to builds the user submitting the build does not have
access to. This allows attackers with Item/Build and Item/Configure
permission to obtain information about the existence of jobs, the existence
of builds, and if a specified build exists, its display name.
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