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.
Published: 2026-08-17
Score: 9.1 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
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Remediation

Vendor Workaround

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.

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History

Tue, 18 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 18 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Mon, 17 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
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.
Title Managedcluster-import-controller: managedcluster-import-controller: csr auto-approver does not validate certificate subject, signername, or requester identity
First Time appeared Redhat
Redhat multicluster Engine
Weaknesses CWE-295
CPEs cpe:/a:redhat:multicluster_engine
Vendors & Products Redhat
Redhat multicluster Engine
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}


Subscriptions

Redhat Multicluster Engine
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-18T15:15:40.084Z

Reserved: 2026-07-27T17:51:24.886Z

Link: CVE-2026-66795

cve-icon Vulnrichment

Updated: 2026-08-18T15:15:36.242Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-17T21:16:47.163

Modified: 2026-08-18T16:18:14.160

Link: CVE-2026-66795

cve-icon Redhat

Severity : Important

Publid Date: 2026-08-17T20:29:00Z

Links: CVE-2026-66795 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-18T00:15:03Z

Weaknesses