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CVE-2026-66794

9.3 · CRITICAL

A flaw was found in the `cluster-proxy-addon` component of Multicluster Engine for Kubernetes.

Published Aug 19, 2026CWE-918EPSS 0.62%

Overview

CVE-2026-66794 is a critical-severity vulnerability. It was published on August 19, 2026 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A flaw was found in the `cluster-proxy-addon` component of Multicluster Engine for Kubernetes. This vulnerability allows an unauthenticated attacker, who can access the user-facing route, to bypass authentication and authorization checks. By manipulating URL path segments, the attacker can proxy requests to arbitrary services across any managed cluster. This enables unauthorized access to internal services that would otherwise be protected, potentially leading to information disclosure or further compromise of the cluster environment.

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-2026-66794Refbugzilla.redhat.com/show_bug.cgi?id=2507539

How CyberStrike helps

Frequently asked questions

What is CVE-2026-66794?

CVE-2026-66794 is a critical-severity vulnerability. It was published on August 19, 2026 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2026-66794?

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-66794?

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-2026-66794?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-66794 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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