CVE-2026-17107CWE-441

CVE-2026-17107

High · published July 24, 2026

CVSS v3.1
8.5
EPSS
1%
Percentile
46.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00568 · 46.3th percentile
Weakness
CWE-441 · Unintended Proxy or Intermediary ('Confused Deputy')
Published
2026-07-24T23:16Z
References (9)
https://access.redhat.com/errata/RHSA-2026:46885 · [email protected]https://access.redhat.com/errata/RHSA-2026:47388 · [email protected]https://access.redhat.com/errata/RHSA-2026:47735 · [email protected]https://access.redhat.com/errata/RHSA-2026:47949 · [email protected]https://access.redhat.com/errata/RHSA-2026:47953 · [email protected]https://access.redhat.com/errata/RHSA-2026:47974 · [email protected]https://access.redhat.com/errata/RHSA-2026:48284 · [email protected]https://access.redhat.com/security/cve/CVE-2026-17107 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2506771 · [email protected]
EPSS history
Timeline
  • 24 JUL 18:56Z
    Cluster-proxy: cluster-proxy: impersonation header injection in service-proxy grants cluster-admin on every managed cluster
    cvelistv5