CVE-2020-2161 Cross-site scripting in Jenkins

What is CVE-2020-2161?

CVE-2020-2161 is a medium-severity cross-site scripting vulnerability in Jenkins Jenkins, published on 25 Mar 2020. 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 2.227 and earlier, LTS 2.204.5 and earlier does not properly escape node labels that are shown in the form validation for label expressions on job configuration pages, resulting in a stored XSS vulnerability exploitable by users able to define node labels.

Weakness: CWE-79

Which versions are affected by CVE-2020-2161?

3 open source packages ship an affected version, including org.jenkins-ci.main:jenkins-core and jenkins. It affects 1 product.

Products include Jenkins Jenkins.

How do I fix CVE-2020-2161?

Upgrade org.jenkins-ci.main:jenkins-core to 2.228 or later.

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-2020-2161 being exploited?

There is no known exploitation of CVE-2020-2161 in the wild and no public exploit code.

Other vulnerabilities in Jenkins Jenkins

• CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal Exploited Critical 9.8
• CVE-2018-1000861 Jenkins Stapler Web Framework Deserialization of Untrusted Data Exploited Critical 9.8
• CVE-2017-1000353 Jenkins Remote Code Execution Exploited Critical 9.8
• CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure Exploited High 7.5
• CVE-2021-21690 Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins Critical 9.8

All Jenkins Jenkins vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-jenkins-2020-2161, GHSA-g8pg-qrvm-wgh2.