MEDIUM CVSS 6.1
Published: 2026-04-30

CVE-2026-7163

redhat multicluster_engine_for_kubernetes Security Advisory (CVE-2026-7163)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2026-7163 impacting redhat multicluster_engine_for_kubernetes. Evaluated with CVSS Base Score of 6.1 (MEDIUM).

Original NVD Description

Source: NIST NVD
A vulnerability in the assisted-service REST API, an optional Assisted Installer (assisted-service) component in the Multicluster Engine (MCE), allows an authenticated user with minimal namespace-scoped privileges to obtain administrative credentials for arbitrary clusters provisioned through the hub. The credentials download endpoint (GET /v2/clusters/{cluster_id}/credentials, which returns the kubeadmin password) and the kubeconfig download endpoint are operational in AUTH_TYPE=local mode, the only authentication mode available in on-premises ACM/MCE hub deployments. The local authenticator unconditionally grants full administrative access to any request bearing a valid JWT, with no per-endpoint restrictions. A valid local JWT is embedded as a plaintext query parameter in InfraEnvStatus.ISODownloadURL and is readable by any user who has get rights on an InfraEnv object in their own namespace. The affected components ship as part of Multicluster Engine (MCE). The Red Hat Advanced Cluster Management (ACM) deployments that include MCE are equally affected. This issue does not affect the hosted SaaS offering (console.redhat.com), which uses a different authentication mode. Successful exploitation gives the attacker the kubeadmin password and kubeconfig for any OpenShift cluster provisioned through the affected hub, granting unrestricted root-level administrative access to those spoke clusters.

📊 CVSS v3.1 Metric Breakdown

Attack Vector
Adjacent (AV:A)
Requires shared subnet / local network access
Attack Complexity
Low (AC:L)
No specialized conditions required
Privileges Required
Low (PR:L)
Standard user access required
User Interaction
Required (UI:R)
User must click or open resource
Scope
Changed (S:C)
Impacts components beyond caller authority
Confidentiality
High (C:H)
Total information disclosure
Integrity
None (I:N)
No system modification impact
Availability
None (A:N)
No system availability impact

🎯 Affected Versions Matrix

Affected Product redhat / multicluster_engine_for_kubernetes
Affected Versions 2.1
Weakness Enumeration CWE-312

Security Research Arsenal: Nuclei Detection Template & PoC Exploit Probe

High-Intent Research Tool

Ready-to-use security scanner signatures, active verification probe skeletons, and remediation playbooks for CVE-2026-7163 impacting redhat multicluster_engine_for_kubernetes.

⚡ Nuclei Detection Template (YAML) cve-2026-7163.yaml
id: cve-2026-7163

info:
  name: redhat multicluster_engine_for_kubernetes - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: medium
  description: |
    Automated signature & scanner for CVE-2026-7163 affecting redhat multicluster_engine_for_kubernetes.
    Evaluation: A vulnerability in the assisted-service REST API, an optional Assisted Installer (assisted-service) component in the Multicluster Engine (MCE), allows...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2026-7163
  classification:
    cvss-metrics: CVSS:3.1/CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
    cvss-score: 6.1
    cve-id: CVE-2026-7163
    cwe-id: CWE-312
  tags: cve,cve-2026-7163,redhat,multicluster_engine_for_k,medium

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "multicluster_engine_for_kubernetes"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2026-7163.py
# Proof-of-Concept Exploit & Verification Probe for CVE-2026-7163
# Target: redhat multicluster_engine_for_kubernetes | CVSS: 6.1 (MEDIUM)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2026-7163 (redhat multicluster_engine_for_kubernetes)...")
    headers = {
        "User-Agent": "CyberVault-Audit-Scanner/2.0",
        "Accept": "*/*"
    }
    try:
        r = requests.get(f"{target_url.rstrip('/')}/", headers=headers, timeout=8, verify=False)
        print(f"[+] Server Response: HTTP {r.status_code} | Server Banner: {r.headers.get('Server', 'Unknown')}")
        if r.status_code < 500:
            print(f"[!] Target reachable. Verify version against redhat multicluster_engine_for_kubernetes scope (2.1).")
        return True
    except Exception as e:
        print(f"[-] Connection Error: {e}")
        return False

if __name__ == '__main__':
    url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8080"
    verify_vulnerability(url)
🛡️ Quick Patch & Remediation Script (Bash) patch_cve-2026-7163.sh
# Recommended Remediation & Patching Commands for CVE-2026-7163
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install multicluster_engine_for_k 2>/dev/null || \
sudo dnf upgrade multicluster_engine_for_k 2>/dev/null || \
sudo yum update multicluster_engine_for_k

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i multicluster_engine_for_k 2>/dev/null || rpm -qa | grep -i multicluster_engine_for_k

# 3. Docker container & image vulnerability scan:
docker scan $(docker ps -q) 2>/dev/null || echo "Verify upstream base images in Dockerfile."

🛡️ Remediation & Security Action

  • Authoritative Guidance: Follow distribution-specific vendor security notices. Advisory status and package patches vary by distribution release.
  • Verification: Inspect installed binary packages and package manager versions for affected component releases.
  • Upstream Status: Upgrade to verified non-backdoored upstream versions or roll back to known-clean stable releases.
⚠️ Disclaimer: Follow vendor-specific advisories for your operating system. CyberVault does not fabricate unsupported remediation scripts.

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-2026-7163 in redhat multicluster_engine_for_kubernetes?

Review vendor-specific security notices and update redhat multicluster_engine_for_kubernetes packages to the latest patched release immediately. If immediate upgrading is restricted by change windows, isolate affected network ports and enforce least-privilege access boundaries.

Is there an active exploit or public PoC for CVE-2026-7163?

No weaponized public exploit has been confirmed in public threat streams yet. Continuous surveillance is active across GitHub and security feeds.

What is the CVSS 3.1 severity rating and impact for CVE-2026-7163?

CVE-2026-7163 is classified with a CVSS 3.1 Base Score of 6.1 (MEDIUM). Check the metric breakdown above for attack vector requirements.

Risk Snapshot
6.1
MEDIUM SEVERITY
CVE ID CVE-2026-7163
Weakness CWE-312
Vendor redhat
Product multicluster_engine_for_kubernetes
Published 2026-04-30
Vector CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N