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Vulnerability details

CVE-2026-66795

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

CVSS 3.1
9.9Critical

Official 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.

CVSS scores

ScoreVersionSourceVector
9.9Critical 3.1 CVEProject cvelistV5 (CNA) (redhat) CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
No product information recorded.

References and advisories

8
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Details

Published
2026-08-18
Last updated
2026-09-29
State
Published
Assigner (CNA)
redhat

Exploit prediction (EPSS)

0.48%
Probability of exploitation in 30 days
42.3%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-295
    Improper Certificate Validation