CVE-2026-84646Network attack vectorHinoki check available

User object creation via nested XML deserialization

Published Sep 2, 2026 · Updated Sep 2, 2026

Deserialization in Jenkins 2.579 and earlier and LTS 2.568.2 and earlier allows remote authenticated users to create user objects via XML. Nested fields in submitted XML can resolve to the User type because Jenkins does not restrict that independently stored type to top-level deserialization. Overall/Read permission is required, and the resulting objects are not login-capable accounts but changelog-style author records.

CVSS severity4.3
Medium
EPSS probability0.28%
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 create user objects via XML. Nested fields in submitted XML can resolve to the User type because Jenkins does not restrict that independently stored type to top-level deserialization. Overall/Read permission is required, and the resulting objects are not login-capable accounts but changelog-style author records.

The record

CVE
CVE-2026-84646
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
Jenkins Project
Product
Jenkins
Classifications
CWE-502
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 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

4.3National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data

Public exploit references

No public exploit references are available in this record.

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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