# CVE-2026-19706: Openshift/installer: openshift installer: unconditional csr approval during agent-based installation (abi) bootstrap

Status: published. Published: 2026-11-09. Updated: 2026-11-09.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Red Hat / Assisted Installer for Red Hat OpenShift Container Platform 2 (assisted/agent-preinstall-image-builder-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Assisted Installer for Red Hat OpenShift Container Platform 2 (rhai/assisted-installer-agent-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Assisted Installer for Red Hat OpenShift Container Platform 2 (rhai/assisted-installer-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Multicluster Engine for Kubernetes (multicluster-engine/assisted-installer-agent-rhel8): Version range not reported. Source: CNA: redhat
- Red Hat / Multicluster Engine for Kubernetes (multicluster-engine/assisted-installer-agent-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Multicluster Engine for Kubernetes (multicluster-engine/assisted-installer-controller-rhel8): Version range not reported. Source: CNA: redhat
- Red Hat / Multicluster Engine for Kubernetes (multicluster-engine/assisted-installer-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-agent-installer-csr-approver-rhel8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-agent-installer-csr-approver-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-agent-installer-orchestrator-rhel8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-agent-installer-orchestrator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 5 (openshift5/ose-agent-installer-csr-approver-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 5 (openshift5/ose-agent-installer-orchestrator-rhel9): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 8.3 (high); CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H; source: CNA: redhat

- CVSS 3.1: 8.3 (high); CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-306

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-19706 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2515215 (CNA: 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/index (CNA: redhat)

- https://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/ (CNA: redhat)

- https://access.redhat.com/security/cve/CVE-2026-19706 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2515215 (secalert@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 (secalert@redhat.com)

- https://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/ (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-19706; retrieved 2026-11-09; source updated 2026-11-09

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-19706; retrieved 2026-11-10; source updated 2026-11-09

Revision: bc62b2cfbc40b2a3c6e7607529c9f2393044680c5058d4b6f4174eda64290b3e

Canonical: https://y2.dev/cve/CVE-2026-19706

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.