Medium4.3Red Hat Linux

Medium [CVE-2026-84646] Unauthorized creation of user objects via deserialization vulnerability

This medium-severity Red Hat Linux advisory covers CVE-2026-84646 affecting OpenShift Developer Tools and Services.

CVE-2026-84646 Published Sep 2, 2026Updated by vendor Sep 2, 2026

CVE-2026-84646

Affected products & platforms

Red Hat LinuxUnclassified

Open vendor advisory

Android app · Google Play

Monitor future Red Hat Linux CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery

Get CVE alerts See app features

Summary

In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, user objects can appear as nested field values in other deserialized XML objects, allowing attackers with Overall/Read permission to create user objects by submitting crafted XML. A flaw was found in Jenkins.

While these created user objects are not actual Jenkins accounts and cannot be used for login, their unauthorized creation could lead to unexpected behavior or resource manipulation within the Jenkins environment. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).

Weakness: CWE-502. Affected Red Hat products: OpenShift Developer Tools and Services.

Red Hat does not currently list a fixing RHSA for this CVE.

Affected versions

2.579
2.568.2

Official advisory · high-confidence parse· fetched 1 hour ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · high-confidence parse· fetched 1 hour ago·verify at source

Mitigation checklist

Recommended fix / mitigation

To mitigate this issue, restrict network access to the Jenkins instance to only trusted users and networks. Additionally, ensure that user permissions are configured with the principle of least privilege, limiting Overall/Read access to only those users who absolutely require it.

Official advisory · high-confidence parse· fetched 1 hour ago·verify at source

Discussion(0)

No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.