During ABI bootstrap, the bootstrap node's approve-csr.service approves and signs every CSR without identity validation.
CVE-2026-19706
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.
Assessment
- CVSS
- 8.3 (v3.1)
- Severity
- High
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 9 November 2026
- Last updated
- 9 November 2026
- Assigner
- redhat
CVSS vectorCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
At the source
References
- https://access.redhat.com/security/cve/CVE-2026-19706
- https://bugzilla.redhat.com/show_bug.cgi?id=2515215
- https://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/installing_an_on-premise_cluster_with_the_agent-based_installer/index
- https://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/
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