MEDIUM CVSS 4.2
Published: 2026-07-15

CVE-2026-55608

n8n-mcp n8n-mcp Security Advisory (CVE-2026-55608)
↗ Official NIST NVD Record
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CyberVault Technical Summary

Analyst Synthesis

Technical analysis, exploit verification, and patch instructions for CVE-2026-55608 impacting n8n-mcp n8n-mcp. Evaluated with CVSS Base Score of 4.2 (MEDIUM).

Original NVD Description

Source: NIST NVD
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.57.4, multi-tenant HTTP mode with ENABLE_MULTI_TENANT=true could allow an authenticated tenant to access default-scope workflow_versions backups instead of being confined to the tenant scope, exposing or deleting workflow-version backups from prior single-tenant deployments or migrations. This issue is fixed in version 2.57.4.

📊 CVSS v3.1 Metric Breakdown

Attack Vector
Network (AV:N)
Exploitable remotely across internet boundaries
Attack Complexity
High (AC:H)
Depends on race conditions or environment
Privileges Required
Low (PR:L)
Standard user access required
User Interaction
None (UI:N)
Zero human interaction required
Scope
Unchanged (S:U)
Confined to same security context
Confidentiality
Low (C:L)
Partial information leakage
Integrity
Low (I:L)
Partial data modification possible
Availability
None (A:N)
No system availability impact

🎯 Affected Versions Matrix

Affected Product n8n-mcp / n8n-mcp
Affected Versions *
Weakness Enumeration CWE-200

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-2026-55608 impacting n8n-mcp n8n-mcp.

⚡ Nuclei Detection Template (YAML) cve-2026-55608.yaml 
id: cve-2026-55608

info:
  name: n8n-mcp n8n-mcp - Security Advisory & Vulnerability Scan
  author: cybervault-security-intel
  severity: medium
  description: |
    Automated signature & scanner for CVE-2026-55608 affecting n8n-mcp n8n-mcp.
    Evaluation: n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.57.4, multi-tenant HTTP ...
  reference:
    - https://cybervault-cve.pages.dev/cve/CVE-2026-55608
  classification:
    cvss-metrics: CVSS:3.1/CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
    cvss-score: 4.2
    cve-id: CVE-2026-55608
    cwe-id: CWE-200
  tags: cve,cve-2026-55608,n8n-mcp,n8n-mcp,medium

http:
  - method: GET
    path:
      - "{BaseURL}/"
      - "{BaseURL}/api/"
    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - "n8n-mcp"
        part: body
🐍 PoC Exploit & Verification Probe (Python 3) poc_cve-2026-55608.py 
# Proof-of-Concept Exploit & Verification Probe for CVE-2026-55608
# Target: n8n-mcp n8n-mcp | CVSS: 4.2 (MEDIUM)
# Educational & Security Audit Purpose Only

import requests
import sys

def verify_vulnerability(target_url):
    print(f"[*] Auditing {target_url} for CVE-2026-55608 (n8n-mcp n8n-mcp)...")
    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 n8n-mcp n8n-mcp scope (*).")
        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-2026-55608.sh 
# Recommended Remediation & Patching Commands for CVE-2026-55608
# 1. Update package via distribution package manager:
sudo apt-get update && sudo apt-get --only-upgrade install n8n-mcp 2>/dev/null || \
sudo dnf upgrade n8n-mcp 2>/dev/null || \
sudo yum update n8n-mcp

# 2. Inspect installed package versions for vulnerable scope:
dpkg -l | grep -i n8n-mcp 2>/dev/null || rpm -qa | grep -i n8n-mcp

# 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.

🔗 Verified Technical References

Authorities
  • No records filed in this category.
Distributions
  • No records filed in this category.

❓ Frequently Asked Questions (FAQ) & Remediation Guide

How do I fix CVE-2026-55608 in n8n-mcp n8n-mcp?

Review vendor-specific security notices and update n8n-mcp n8n-mcp 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-2026-55608?

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-2026-55608?

CVE-2026-55608 is classified with a CVSS 3.1 Base Score of 4.2 (MEDIUM). Check the metric breakdown above for attack vector requirements.

🕸️ Spider Mesh Intelligence Graph (Connected Advisories)

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Risk Snapshot
4.2
MEDIUM SEVERITY
CVE ID CVE-2026-55608
Weakness CWE-200
Vendor n8n-mcp
Product n8n-mcp
Published 2026-07-15
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
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