CVE-2018-1999006: Exposure of Sensitive Information in Jenkins
Summary
CVE-2018-1999006: Exposure of Sensitive Information to an Unauthorized Actor in Jenkins. Affects org.jenkins-ci.main:jenkins-core across 2 version ranges.
< 2.121.2
>= 2.122, < 2.132
Fixed in 2.121.2 or 2.132, depending on the release line you run. How to fix ↓
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Background
Jenkins is an open-source automation server that enables developers to build, test, and deploy their software projects. The 'jenkins-core' package is a fundamental component of Jenkins, providing core functionalities and APIs. This package is written in Java and is widely used in various software development environments.
Vulnerability Detail
The vulnerability identified as CVE-2018-1999006 affects Jenkins versions 2.132 and earlier, as well as 2.121.1 and earlier. It involves the exposure of sensitive information through the Plugin.java file. Attackers can exploit this vulnerability to determine the date and time when a plugin HPI/JPI file was last extracted, which typically corresponds to the date of the most recent installation or upgrade. This information can be leveraged by malicious actors to gain insights into the system's update history and potentially identify vulnerabilities or weaknesses.
How To Fix
Latest published version: 2.587 as of 22 Oct 2026
Upgrading to it may include breaking changes; the versions below are the minimum fixed release for this vulnerability.
If you can't move to the latest
The minimum fixed version depends on the release line you run.
-
< 2.121.22.121.2 -
>= 2.122, < 2.1322.132
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
There is no specific workaround provided for this vulnerability. Users are advised to apply the recommended fixes by upgrading to the patched versions of Jenkins.
Conclusion
The exposure of sensitive information vulnerability in Jenkins can be mitigated by applying the recommended fixes through upgrading to the patched versions. It is crucial for Jenkins users to stay updated with the latest security patches to ensure the integrity and security of their software development environment. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows unauthorized actors to determine the date and time of the most recent plugin installation or upgrade. While this information may not directly lead to a compromise, it can aid attackers in identifying potential vulnerabilities or weaknesses in the system.
No, only versions 2.132 and earlier, as well as 2.121.1 and earlier, are affected by this vulnerability.
There is no known exploit available for this vulnerability at the time of this report. However, it is crucial to apply the recommended fixes to mitigate any potential risks.
No, this vulnerability does not allow for remote exploitation. An attacker would need to have access to the system to exploit this vulnerability.
There is no evidence of active exploitation of this vulnerability reported at the time of this report.
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