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CVE-2026-17107 — A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced…

Key facts

CVE-2026-17107 is a High (8.5) vulnerability: A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-17107
Severity High (8.5)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-17107/

Details

English | 한국어

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.

Vulnerability Details

Property Value
CVE ID CVE-2026-17107
CVSS Score 8.5

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-17107/poc.py

Usage

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start

# Clone and navigate to CVE directory
cd CVE-2026-17107

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints

Application URL Status
Vulnerable App http://localhost:8080 Shows vulnerability
Patched App http://localhost:8081 Demonstrates fix

Directory Structure

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References

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

Generated by PoC Generator on 2026-08-04T12:19:01.332312929

Frequently asked questions

What is CVE-2026-17107?

CVE-2026-17107 is a High (8.5) vulnerability: A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-17107?

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2026-17107?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.