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CVE-2026-84671 Jenkins Project CVE debrief

The Jenkins File Parameter Plugin, specifically version 425.v3fa_801681b_5e and earlier, is vulnerable to remote code execution due to improper handling of Stapler data binding. This allows attackers to write files to arbitrary locations on the Jenkins controller file system. The CVE record was published on 2026-09-02T16:17:31.737Z and has not been modified since then. Administrators of Jenkins instances using the File Parameter Plugin should be aware of the potential risks and take necessary precautions.

Vendor
Jenkins Project
Product
Jenkins File Parameter Plugin
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-02
Original CVE updated
2026-09-03
Advisory published
2026-09-02
Advisory updated
2026-09-03

Who should care

Administrators of Jenkins instances using the File Parameter Plugin, security teams responsible for monitoring and patching vulnerabilities in Jenkins environments, and operators of Jenkins instances should be aware of the potential risks and take necessary precautions to protect their systems.

Technical summary

The Jenkins File Parameter Plugin 425.v3fa_801681b_5e and earlier is vulnerable to remote code execution due to improper handling of Stapler data binding, allowing attackers to write files to arbitrary locations on the Jenkins controller file system. This vulnerability can be exploited by attackers to execute arbitrary code on the Jenkins controller, potentially leading to a complete compromise of the system.

Defensive priority

Administrators of Jenkins instances should prioritize patching the File Parameter Plugin to prevent potential remote code execution.

Recommended defensive actions

  • Patch Jenkins File Parameter Plugin to version greater than 425.v3fa_801681b_5e
  • Restrict access to Jenkins controller file system
  • Monitor Jenkins instance for suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record indicates that Jenkins File Parameter Plugin 425.v3fa_801681b_5e and earlier allows writing files to arbitrary locations on the Jenkins controller file system through Stapler data binding, which can lead to remote code execution. However, details are limited, and further verification is required to fully understand the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-84671 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-84671

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-84671 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-84671

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.