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Date: Tue, 26 Jan 2021 11:46:34 +0100
From: Daniel Beck <>
Subject: Vulnerability 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 2.276
* Jenkins LTS 2.263.3

Summaries of the vulnerabilities are below. More details, severity, and
attribution can be found here:

We provide advance notification for security updates on this mailing list:

If you discover security vulnerabilities in Jenkins, please report them as
described here:


SECURITY-2197 / CVE-2021-21615
Due to a time-of-check to time-of-use (TOCTOU) race condition, the file
browser for workspaces, archived artifacts, and
`$JENKINS_HOME/userContent/` follows symbolic links to locations outside
the directory being browsed in Jenkins 2.275 and LTS 2.263.2.

This allows attackers with Job/Workspace permission and the ability to
control workspace contents, e.g., with Job/Configure permission or the
ability to change SCM contents, to create symbolic links that allow them to
access files outside workspaces using the workspace browser.

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