CVE-2026-17107
Cluster-proxy: impersonation-header injection grants cluster-admin on every managed cluster
Description
A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced Cluster Management for Kubernetes (RHACM) and multicluster-engine (MCE). The service-proxy appends impersonation group headers to proxied requests without first removing caller-supplied values, and the spoke ServiceAccount holds unrestricted impersonation permissions. An authenticated hub principal can inject an Impersonate-Group header to escalate to cluster-admin on every managed cluster.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:LPrivileges RequiredLow
UI:NUser InteractionNone
Scope
S:CScopeChanged
Impact
C:HConfidentialityHigh
I:HIntegrityHigh
A:HAvailabilityHigh
Weaknesses
Affected Products
Red Hat
commercial·US
Exploitability
Workaround Available
References
https://access.redhat.com/errata/RHSA-2026:46885
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:47388
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:47735
access.redhat.com
and 6 more references View all →
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