CVE-2026-84645Public exploitNetwork attack vectorHinoki check available

Authenticated code execution via nested configuration objects

Published Sep 2, 2026 · Updated Sep 3, 2026

Deserialization in Jenkins 2.579 and earlier and LTS 2.568.2 and earlier allows remote authenticated users to execute code. XStream accepts PersistenceRoot implementations as nested values in submitted config.xml object graphs, allowing Stapler to route later requests through those objects to an improperly protected Script Console. Exploitation requires low-privileged authenticated access capable of submitting configuration XML; success runs code on the Jenkins controller.

CVSS severity8.8
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Deserialization in Jenkins 2.579 and earlier and LTS 2.568.2 and earlier allows remote authenticated users to execute code. XStream accepts PersistenceRoot implementations as nested values in submitted config.xml object graphs, allowing Stapler to route later requests through those objects to an improperly protected Script Console. Exploitation requires low-privileged authenticated access capable of submitting configuration XML; success runs code on the Jenkins controller.

The record

CVE
CVE-2026-84645
Published
Sep 2, 2026
Updated
Sep 3, 2026
Vendor
Jenkins Project
Product
Jenkins
Classifications
CWE-94, CWE-915, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · JenkinsAffected versions are unavailable in this record.

Published CVSS scores

8.8CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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