CVE-2026-17107

high Red Hat
CVSS v3 Base Score
8.5
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS Score
0.2%
Exploitation probability in 30 days
Top 87% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: July 24, 2026 (44 days ago)
Last Modified: July 24, 2026
Vendor: Red Hat
Source: REDHAT

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.

CWE

CWE-441

Affected Products

Multicluster Engine for Kubernetes

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov