High severity · published Jul 24, 2026
CVE-2026-17107
Cluster-proxy: impersonation-header injection grants cluster-admin on every managed cluster
8.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
multicluster engine for Kubernetes 2.10 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.11 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.17 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.6 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.8 · Red Hat
All versions, or not specified · source: vendor
ME
multicluster engine for Kubernetes 2.9 · Red Hat
All versions, or not specified · source: vendor
Affected product
ME
multicluster engine for Kubernetes 2.10
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-17107
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-17107
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:46885
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:47388
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:47735
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:47949
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:47953
vendor-advisory
https://access.redhat.com/errata/RHSA-2026:47974
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