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CVE-2026-66795

Managedcluster-import-controller: csr auto-approver does not validate certificate subject or signername (spoke→hub cluster-admin)

Published: Aug 17, 2026Updated: Sep 8, 2026 Sources: CVE List NVDCWE-295
9.9CRITICAL
NVD MITRE
EPSS Score
0.5%
Top 60.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-295

Affected Products

Red Hat
commercial·US
multicluster engine for Kubernetes 2.1On-prem
Operating Systems / linux-distro
multicluster engine for Kubernetes 2.11On-prem
Cloud & SaaS / container-orchestration
multicluster engine for Kubernetes 2.17On-prem
Operating Systems / linux-distro
multicluster engine for Kubernetes 2.6On-prem
Cloud & SaaS / container-orchestration
multicluster engine for Kubernetes 2.8On-prem
Cloud & SaaS / container-orchestration
multicluster engine for Kubernetes 2.9On-premSaaS Service
Cloud & SaaS / container-orchestration

Exploitability

Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

https://access.redhat.com/errata/RHSA-2026:59556
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:59557
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:59558
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and 5 more references View all →

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