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Fencer Intel
high 8.3

CVE-2026-19706 json

Openshift/installer: openshift installer: unconditional csr approval during agent-based installation (abi) bootstrap

published 6h ago modified 1h ago also EUVD-2026-120121

cvss
8.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
—
no EPSS score yet
public exploits
0
none known

Summary

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.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-19706 updated cvss 8.3

openshift/installer: OpenShift Installer: Unconditional CSR approval during Agent-Based Installation (ABI) bootstrap

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-agent-rhel9, rhai/assisted-installer-controller-rhel9 Red Hat Multicluster Engine for Kubernetes multicluster-engine/assisted-installer-agent-rhel8, multicluster-engine/assisted-installer-agent-rhel9, multicluster-engine/assisted-installer-controller-rhel8, multicluster-engine/assisted-installer-controller-rhel9 Red Hat OpenShift Container Platform 4 openshift4/ose-agent-installer-csr-approver-rhel8, openshift4/ose-agent-installer-csr-approver-rhel9 Red Hat OpenShift Container Platform 5 openshift5/ose-agent-installer-csr-approver-rhel9
    affected: no fix available
  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 assisted/agent-preinstall-image-builder-rhel9 Red Hat OpenShift Container Platform 4 openshift4/ose-agent-installer-orchestrator-rhel8, openshift4/ose-agent-installer-orchestrator-rhel9 Red Hat OpenShift Container Platform 5 openshift5/ose-agent-installer-orchestrator-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
1h ago

CVSS scores

assigned by version score vector
CNA 3.1 8.3 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 8.3 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2
  • Red Hat Multicluster Engine for Kubernetes
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.