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CVE-2026-66795

9.1 · CRITICAL

A flaw was found in the managedcluster-import-controller.

Published Aug 17, 2026CWE-295EPSS 0.49%

Overview

CVE-2026-66795 is a critical-severity vulnerability. It was published on August 17, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2026:59556Refaccess.redhat.com/errata/RHSA-2026:59557Refaccess.redhat.com/errata/RHSA-2026:59558Refaccess.redhat.com/errata/RHSA-2026:59559Refaccess.redhat.com/errata/RHSA-2026:59579Refaccess.redhat.com/errata/RHSA-2026:59593Refaccess.redhat.com/security/cve/CVE-2026-66795Refbugzilla.redhat.com/show_bug.cgi?id=2507540

How CyberStrike helps

Frequently asked questions

What is CVE-2026-66795?

CVE-2026-66795 is a critical-severity vulnerability. It was published on August 17, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-66795?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-66795?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-66795?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-66795 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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