CVE-2026-66794
Received Received - Intake

Authentication Bypass in Multicluster Engine for Kubernetes

Publication date: 2026-08-19

Last updated on: 2026-08-19

Assigner: redhat-SADP

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.

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Meta Information

Published
2026-08-19
Last Modified
2026-08-19
Generated
2026-08-19
AI Q&A
2026-08-19
EPSS Evaluated
N/A
NVD
CVE-2026-66794
EUVD
EUVD-2026-62598

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
redhat cluster-proxy-addon *
red_hat cluster_proxy_addon *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

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Executive Summary

CVE-2026-66794 is a Server-Side Request Forgery (SSRF) flaw in the cluster-proxy-addon component of Red Hat's Multicluster Engine for Kubernetes. It allows unauthenticated attackers to bypass authentication and authorization checks by manipulating URL path segments. This enables them to proxy requests to arbitrary services across any managed cluster, potentially accessing internal services that should be protected.

Detection Guidance

Check if the cluster-proxy-addon user-facing route is exposed to untrusted networks by inspecting network policies and firewall rules. Use commands like 'oc get routes -n <namespace>' to list routes and 'oc describe route <route-name> -n <namespace>' to verify route configurations. Monitor logs for unusual proxy requests or unauthorized access attempts.

Impact Analysis

This vulnerability could lead to unauthorized access to internal services, resulting in information disclosure or further compromise of the cluster environment. Attackers might exploit it to exfiltrate sensitive data or pivot to other systems within the cluster.

Compliance Impact

This vulnerability could violate compliance requirements like GDPR or HIPAA by enabling unauthorized access to protected data. It may lead to data breaches, exposing sensitive information and failing to meet regulatory security standards.

Mitigation Strategies

Restrict network access to the cluster-proxy-addon user-facing route by implementing firewall rules to allow connections only from trusted networks. Temporarily disable the route if immediate mitigation is required. Apply patches or updates from Red Hat once available. Monitor for suspicious activity in logs.

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