CVE-2026-66795

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. 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.

Affected Software

VendorProductVersion RangeStatus
Red Hatmulticluster engine for Kubernetes 2.101787078272 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.111787078330 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.171786577915 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.61787260779 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.81787259044 < *unaffected
Red Hatmulticluster engine for Kubernetes 2.91787078307 < *unaffected

Weaknesses

  • CWE-295: Improper Certificate Validation

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References