During ABI bootstrap, the bootstrap node's approve-csr.service approves and signs every CSR without identity validation.

An attacker on the install network can retrieve the unauthenticated Ignition file (ports 22623/22624), extract a limited kubeconfig, submit a CSR for CN=system:admin, receive the signed certificate, and gain full cluster-admin access.

Exploitable only during the narrow bootstrap window.
Advisories

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Fixes

Solution

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Workaround

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History

Mon, 09 Nov 2026 17:30:00 +0000

Type Values Removed Values Added
Description During ABI bootstrap, the bootstrap node's approve-csr.service approves and signs every CSR without identity validation. An attacker on the install network can retrieve the unauthenticated Ignition file (ports 22623/22624), extract a limited kubeconfig, submit a CSR for CN=system:admin, receive the signed certificate, and gain full cluster-admin access. Exploitable only during the narrow bootstrap window.
Title Openshift/installer: openshift installer: unconditional csr approval during agent-based installation (abi) bootstrap
First Time appeared Redhat
Redhat assisted Installer
Redhat multicluster Engine
Redhat openshift
Weaknesses CWE-306
CPEs cpe:/a:redhat:assisted_installer:2
cpe:/a:redhat:multicluster_engine
cpe:/a:redhat:openshift:4
cpe:/a:redhat:openshift:5
Vendors & Products Redhat
Redhat assisted Installer
Redhat multicluster Engine
Redhat openshift
References
Metrics cvssV3_1

{'score': 8.3, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-11-09T17:20:11.310Z

Reserved: 2026-08-13T09:18:22.162Z

Link: CVE-2026-19706

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses