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CVE-2018-1000861

9.8, critical Known exploited

Jenkins Stapler Web Framework Deserialization of Untrusted Data Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
98% higher than 99.9% of scored CVEs
Exploitation
Confirmed in the wild
Published
10 Dec 20187 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 10 Feb 2022. US federal agencies had to remediate by 10 Aug 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.

Details

Vendor
Jenkins and 1 more
Product
Jenkins
Weakness
CWE-502 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
cve@mitre.org

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 5

Exploit code 1

Advisories 3

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Jenkins CVEs

Every Jenkins CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2024-23897 Jenkins Command Line Interface (CLI) Path Traversal Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2019-1003029 Jenkins Script Security Plugin Sandbox Bypass Vulnerability KEV EPSS 74% 9.9, critical
  • CVE-2019-1003030 Jenkins Matrix Project Plugin Remote Code Execution Vulnerability KEV EPSS 97% 9.9, critical
  • CVE-2017-1000353 Jenkins Remote Code Execution Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2015-5317 Jenkins User Interface (UI) Information Disclosure Vulnerability KEV EPSS 23% 7.5, high

Beyond this page

Is CVE-2018-1000861 in your network?

This page tells you how dangerous CVE-2018-1000861 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2018-1000861 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

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    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.