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{"acknowledgement": "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.", "bugzilla": {"description": "openshift/installer: OpenShift Installer: Unconditional CSR approval during Agent-Based Installation (ABI) bootstrap", "id": "2515215", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515215"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.3", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-306", "details": ["During ABI bootstrap, the bootstrap node's approve-csr.service approves and signs every CSR without identity validation.\nAn 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.\nExploitable only during the narrow bootstrap window."], "name": "CVE-2026-19706", "package_state": [{"cpe": "cpe:/a:redhat:assisted_installer:2", "fix_state": "Not affected", "package_name": "assisted/agent-preinstall-image-builder-rhel9", "product_name": "Assisted Installer for Red Hat OpenShift Container Platform 2"}, {"cpe": "cpe:/a:redhat:assisted_installer:2", "fix_state": "Affected", "package_name": "rhai/assisted-installer-agent-rhel9", "product_name": "Assisted Installer for Red Hat OpenShift Container Platform 2"}, {"cpe": "cpe:/a:redhat:assisted_installer:2", "fix_state": "Affected", "package_name": "rhai/assisted-installer-controller-rhel9", "product_name": "Assisted Installer for Red Hat OpenShift Container Platform 2"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/assisted-installer-agent-rhel8", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/assisted-installer-agent-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/assisted-installer-controller-rhel8", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/assisted-installer-controller-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-agent-installer-csr-approver-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-agent-installer-csr-approver-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-agent-installer-orchestrator-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift4/ose-agent-installer-orchestrator-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Affected", "package_name": "openshift5/ose-agent-installer-csr-approver-rhel9", "product_name": "Red Hat OpenShift Container Platform 5"}, {"cpe": "cpe:/a:redhat:openshift:5", "fix_state": "Not affected", "package_name": "openshift5/ose-agent-installer-orchestrator-rhel9", "product_name": "Red Hat OpenShift Container Platform 5"}], "public_date": "2026-11-09T15:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-19706\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-19706\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/installing_an_on-premise_cluster_with_the_agent-based_installer/index\nhttps://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/"], "statement": "During an OpenShift Agent-Based Installation (ABI), an attacker with network access to the bootstrap node's Kubernetes API can gain cluster-admin privileges.\nThis flaw arises from the `approve-csr.service` unconditionally approving CertificateSigningRequests, allowing an attacker to submit a crafted request for `system:admin` identity. Exploitation is limited to the brief ABI bootstrap window and requires network adjacency to the API server.", "threat_severity": "Important"}

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