CVE-2026-19706
Openshift/installer: openshift installer: unconditional csr approval during agent-based installation (abi) bootstrap
CVSS Score
8.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-306 |
| Vendor | red hat |
| Product | assisted installer for red hat openshift container platform 2 |
| Published | Nov 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Red Hat / Assisted Installer for Red Hat OpenShift Container Platform 2
All versions affected Red Hat / Assisted Installer for Red Hat OpenShift Container Platform 2
All versions affected Red Hat / Assisted Installer for Red Hat OpenShift Container Platform 2
All versions affected Red Hat / Multicluster Engine for Kubernetes
All versions affected Red Hat / Multicluster Engine for Kubernetes
All versions affected Red Hat / Multicluster Engine for Kubernetes
All versions affected Red Hat / Multicluster Engine for Kubernetes
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 5
All versions affected Red Hat / Red Hat OpenShift Container Platform 5
All versions affected References
access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-19706 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2515215 docs.redhat.com: https://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/installing_an_on-premise_cluster_with_the_agent-based_installer/index kubernetes.io: https://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/
Credits
Red Hat would like to thank Chi Zhang (cz21) (External Researcher (August 8, 2026)) and Christopher Lusk (North Echo Security Research (August 26, 2026)) for reporting this issue.