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MEDIUM severity

CVE-2018-1999006 — jenkins-core

MEDIUMFix: jenkinsci/jenkins@f46842c

CVE-2018-1999006 is a medium-severity (CVSS 4.3) Information Exposure vulnerability in org.jenkins-ci.main:jenkins-core. A fix is available for org.jenkins-ci.main:jenkins-core — see the affected versions and patch details below.

Exposure of Sensitive Information to an Unauthorized Actor in Jenkins

Also known asGHSA-2pp9-r4rv-6p6j
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Oct 27, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs61th percentile — riskier than 61% of all scored CVEsHighest risk
0.00%0.48%0.96%1.44%0.2%0.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
☕org.jenkins-ci.main:jenkins-core☕org.jenkins-ci.main:jenkins-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

A exposure of sensitive information vulnerability exists in Jenkins 2.132 and earlier, 2.121.1 and earlier in Plugin.java that allows attackers to determine the date and time when a plugin HPI/JPI file was last extracted, which typically is the date of the most recent installation/upgrade.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jenkins-ci.main:jenkins-coreall versions2.121.2org.jenkins-ci.main:jenkins-core:2.121.2
☕Mavenorg.jenkins-ci.main:jenkins-core≥ 2.122&&< 2.1322.132org.jenkins-ci.main:jenkins-core:2.132

Affected Products

1 product · 2 configurations
Application
jenkinsjenkins
≤ 2.132
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.main:jenkins-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.jenkins-ci.main:jenkins-core to 2.121.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-1999006 is resolved across your whole dependency graph.

  3. Workarounds

    Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Frequently Asked Questions

A exposure of sensitive information vulnerability exists in Jenkins 2.132 and earlier, 2.121.1 and earlier in Plugin.java that allows attackers to determine the date and time when a plugin HPI/JPI file was last extracted, which typically is the date of the most recent installation/upgrade.
O3 Security · Impact-Aware SCA

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CVE-2018-1999006: jenkins-core — Fixed in 2.121.2