CVE-2018-1000863: Improper Limitation of a Pathname to a Restricted Directory in Jenkins
Summary
CVE-2018-1000863: Improper Limitation of a Pathname to a Restricted Directory in Jenkins. Affects org.jenkins-ci.main:jenkins-core across 2 version ranges.
< 2.138.4
>= 2.140, < 2.154
Fixed in 2.138.4 or 2.154, 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 in focus is 'org.jenkins-ci.main:jenkins-core'.
Vulnerability Detail
The vulnerability identified as CVE-2018-1000863 exists in Jenkins versions 2.153 and earlier, LTS 2.138.3 and earlier. It stems from a data modification flaw in the User.java and IdStrategy.java files. Attackers can exploit this vulnerability by submitting crafted user names, leading to an improper migration of user record storage formats. As a result, the victim may be prevented from logging into Jenkins. The severity of this vulnerability is rated as HIGH with a CVSS score of 8.2.
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.
-
< 2.138.42.138.4 -
>= 2.140, < 2.1542.154
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 known workaround for this vulnerability. It is essential to apply the recommended fix by upgrading to the fixed versions of Jenkins.
Conclusion
In conclusion, the vulnerability CVE-2018-1000863 in Jenkins can be exploited to manipulate user record storage formats, potentially denying access to Jenkins. It is crucial to upgrade to the fixed versions of Jenkins to mitigate this vulnerability. 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.
This vulnerability allows attackers to manipulate user record storage formats, potentially preventing users from logging into Jenkins.
You can use the Vulert Playground at Vulert Scanner to check if your Jenkins installation is affected by this vulnerability.
The CVSS score of this vulnerability is 8.2, indicating a high severity.
No, there is no known workaround. It is recommended to upgrade to the fixed versions of Jenkins.
References
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