CVE-2018-1000861VulnerabilityPublished 02/10/2022Updated 10/24/2026

CVE-2018-1000861: Jenkins Stapler Web Framework Deserialization of Untrusted Data Vulnerability

Affects Jenkins Jenkins Stapler Web FrameworkSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 02/10/2022
KEV deadline: 08/10/2022
EPSS: 98.3% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2018-1000861 (opens in a new tab)

Description

CVE-2018-1000861 is a high-severity code execution vulnerability in the Stapler web framework used by Jenkins. It involves deserialization of untrusted data, which can lead to remote code execution. This vulnerability has been exploited in the wild. No specific affected versions or patch information are provided in the input data.

Summary

This vulnerability (CVE-2018-1000861) affects the Stapler web framework component of Jenkins. It allows attackers to execute arbitrary code by exploiting unsafe deserialization of untrusted data. The vulnerability is classified under CWE-502 (Deserialization of Untrusted Data). It has been observed in active exploitation campaigns. However, no detailed version ranges or patch information are included in the provided data.

Impact

Successful exploitation can lead to remote code execution on the Jenkins server, potentially allowing attackers to take full control of the affected system. The vulnerability has been confirmed to be exploited in the wild, indicating active threat to Jenkins installations using the vulnerable Stapler framework.

Mitigation

Patch status is not yet confirmed — check the official Jenkins vendor advisory for current remediation guidance. Since no patch or workaround information is provided, users should monitor Jenkins security advisories and apply updates as soon as they are available.

Weaknesses

CWE-502Deserialization of Untrusted Data (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 10:11:22 UTC

Weaknesses

References

Related threats