CVE-2018-1999045: Improper Authentication in Jenkins
Summary
CVE-2018-1999045: Improper Authentication in Jenkins. Affects org.jenkins-ci.main:jenkins-core across 2 version ranges.
< 2.121.3
>= 2.122, < 2.138
Fixed in 2.121.3 or 2.138, 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. It provides a wide range of features and plugins to support continuous integration and delivery. The vulnerable package, org.jenkins-ci.main:jenkins-core, is a core component of Jenkins responsible for its basic functionality.
Vulnerability Detail
The vulnerability, identified as CVE-2018-1999045, is an improper authentication issue in Jenkins. Specifically, it exists in versions 2.137 and earlier, 2.121.2 and earlier in SecurityRealm.java and TokenBasedRememberMeServices2.java. Attackers with a valid cookie can remain logged in even if the 'remember me' feature is disabled. This can lead to unauthorized access and potential misuse of Jenkins resources.
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.
-
< 2.121.32.121.3 -
>= 2.122, < 2.1382.138
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 mentioned for this vulnerability. However, users can mitigate the risk by ensuring that the 'remember me' feature is enabled and monitoring their Jenkins instance for any unauthorized activity.
Conclusion
In conclusion, the vulnerability CVE-2018-1999045 in Jenkins allows attackers to bypass authentication and gain unauthorized access to Jenkins resources. It is crucial to upgrade to the fixed versions of Jenkins to ensure the security and integrity of the system. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for org.jenkins-ci.main:jenkins-core →
FAQ
Jenkins is an open-source automation server used for continuous integration and delivery of software projects.
The vulnerable package is org.jenkins-ci.main:jenkins-core, which is a core component of Jenkins responsible for its basic functionality.
This vulnerability allows attackers with a valid cookie to remain logged in even if the 'remember me' feature is disabled, potentially leading to unauthorized access and misuse of Jenkins resources.
To fix this vulnerability, it is recommended to upgrade to the fixed versions of Jenkins (2.121.3 or newer for versions 2.121.2 and earlier, and 2.138 or newer for versions 2.122 and later).
While no specific workaround is mentioned, users can mitigate the risk by enabling the 'remember me' feature and monitoring their Jenkins instance for any unauthorized activity.
References
Related vulnerabilities
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