CVE-2026-19706
Openshift/installer: openshift installer: unconditional csr approval during agent-based installation (abi) bootstrap
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Assisted Installer for Red Hat OpenShift Container Platform 2 Red Hat assisted/agent-preinstall-image-builder-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Assisted Installer for Red Hat OpenShift Container Platform 2 Red Hat rhai/assisted-installer-agent-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Assisted Installer for Red Hat OpenShift Container Platform 2 Red Hat rhai/assisted-installer-controller-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Multicluster Engine for Kubernetes Red Hat multicluster-engine/assisted-installer-agent-rhel8
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Multicluster Engine for Kubernetes Red Hat multicluster-engine/assisted-installer-agent-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Multicluster Engine for Kubernetes Red Hat multicluster-engine/assisted-installer-controller-rhel8
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Multicluster Engine for Kubernetes Red Hat multicluster-engine/assisted-installer-controller-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift4/ose-agent-installer-csr-approver-rhel8
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift4/ose-agent-installer-csr-approver-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift4/ose-agent-installer-orchestrator-rhel8
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift4/ose-agent-installer-orchestrator-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
| Red Hat OpenShift Container Platform 5 Red Hat openshift5/ose-agent-installer-csr-approver-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 5 Red Hat openshift5/ose-agent-installer-orchestrator-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 8.3 high |
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H | CNA: redhat |
| 3.1 / 8.3 high |
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/security/cve/CVE-2026-19706CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2515215CNA: redhat · issue-tracking, x_refsource_REDHAT
- https://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/installing_an_on-premise_cluster_with_the_agent-based_installer/indexCNA: redhat
- https://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/CNA: redhat
- https://access.redhat.com/security/cve/CVE-2026-19706[email protected]
- https://bugzilla.redhat.com/show_bug.cgi?id=2515215[email protected]
- https://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/installing_an_on-premise_cluster_with_the_agent-based_installer/index[email protected]
- https://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/[email protected]
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