{"id":"CVE-2026-66795","title":"A flaw was found in the managedcluster-import-controller","summary":"A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. …","severity":"critical","cvss":9.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-295"],"vendor":"Red Hat","product":"multicluster-engine/managedcluster-import-controller-rhel9","affected":["multicluster-engine/managedcluster-import-controller-rhel9 (all versions)","multicluster-engine/managedcluster-import-controller-rhel9 (all versions)","multicluster-engine/managedcluster-import-controller-rhel9 (all versions)","multicluster-engine/managedcluster-import-controller-rhel9 (all versions)","multicluster-engine/managedcluster-import-controller-rhel9 (all versions)","multicluster-engine/managedcluster-import-controller-rhel9 (all versions)"],"published":"2026-08-17","updated":"2026-09-08","sourceUpdated":"2026-09-08T13:17:21.200","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-66795","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:59556","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59557","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59558","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59559","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59579","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59593","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-66795","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507540","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-66795.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-66795"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66795"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-08-18T15:15:25.705433Z"},"epss":0.00318,"epssPercentile":0.24848,"ingestedAt":"2026-09-05T18:43:14.578Z","patched":["multicluster_engine_for_kubernetes 2.11","multicluster_engine_for_kubernetes 2.17","multicluster_engine_for_kubernetes 2.1","multicluster_engine_for_kubernetes 2.6","multicluster_engine_for_kubernetes 2.8","multicluster_engine_for_kubernetes 2.9"],"slug":"CVE-2026-66795","body":"## Overview\n\nA flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a spoke cluster to submit a malicious CSR. Successful exploitation can lead to privilege escalation, enabling the attacker to obtain administrative credentials on the hub cluster.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:59556** · Red Hat · fixed in: multicluster engine for Kubernetes 2.11 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59556)\n- **RHSA-2026:59593** · Red Hat · fixed in: multicluster engine for Kubernetes 2.17 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59593)\n- **RHSA-2026:59557** · Red Hat · fixed in: multicluster engine for Kubernetes 2.1 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59557)\n- **RHSA-2026:59579** · Red Hat · fixed in: multicluster engine for Kubernetes 2.6 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59579)\n- **RHSA-2026:59558** · Red Hat · fixed in: multicluster engine for Kubernetes 2.8 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59558)\n- **RHSA-2026:59559** · Red Hat · fixed in: multicluster engine for Kubernetes 2.9 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59559)","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":54.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}