Strix
63.9K

CVE-2026-66795

CRITICALCVSS 9.9/10EPSS 0.32%

Last modified

CVE-2026-66795 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. 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. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.9/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Probability
0.32%

24.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
Red Hatmulticluster engine for Kubernetes 2.1All versions
Red Hatmulticluster engine for Kubernetes 2.11All versions
Red Hatmulticluster engine for Kubernetes 2.17All versions
Red Hatmulticluster engine for Kubernetes 2.6All versions
Red Hatmulticluster engine for Kubernetes 2.8All versions
Red Hatmulticluster engine for Kubernetes 2.9All versions

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-66795?
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.
How severe is CVE-2026-66795?
CVE-2026-66795 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.
How do I fix CVE-2026-66795?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-66795?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST