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CVE-2026-17107

8.5 · HIGH

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).

Published Jul 24, 2026CWE-441EPSS 0.57%

Overview

CVE-2026-17107 is a high-severity vulnerability. It was published on July 24, 2026 and has a CVSS 3.1 base score of 8.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2026:46885Refaccess.redhat.com/errata/RHSA-2026:47388Refaccess.redhat.com/errata/RHSA-2026:47735Refaccess.redhat.com/errata/RHSA-2026:47949Refaccess.redhat.com/errata/RHSA-2026:47953Refaccess.redhat.com/errata/RHSA-2026:47974Refaccess.redhat.com/errata/RHSA-2026:48284Refaccess.redhat.com/security/cve/CVE-2026-17107Refbugzilla.redhat.com/show_bug.cgi?id=2506771

How CyberStrike helps

Frequently asked questions

What is CVE-2026-17107?

CVE-2026-17107 is a high-severity vulnerability. It was published on July 24, 2026 and has a CVSS 3.1 base score of 8.5 (HIGH).

How severe is CVE-2026-17107?

This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-17107?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-17107?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-17107 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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