Exposure in Red Hat Advanced Cluster Management for Kubernetes Due to Service Proxy Vulnerability
CVE-2026-17107

8.5HIGH

Key Information:

Vendor

Red Hat
Status
Multicluster Engine For Kubernetes 2.10
Multicluster Engine For Kubernetes 2.11
Multicluster Engine For Kubernetes 2.17
Multicluster Engine For Kubernetes 2.6
Vendor
CVE Published:
24 July 2026

What is CVE-2026-17107?

A vulnerability exists in the service-proxy component of Red Hat Advanced Cluster Management for Kubernetes where impersonation group headers are appended to proxied requests without validating caller-supplied values. As a result, an authenticated hub principal can misuse the spoke ServiceAccount's unrestricted impersonation permissions, injecting an Impersonate-Group header that allows for escalation to cluster-admin rights across all managed clusters.

Affected Version(s)

multicluster engine for Kubernetes 2.10 1784342329

multicluster engine for Kubernetes 2.10 1784342329

multicluster engine for Kubernetes 2.11 1784925025

References

https://access.redhat.com/errata/RHSA-2026:46885
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47388
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47735
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Arpit Jain and Kahiro Okina (Craftsman Software, Inc.) for reporting this issue.
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