CVE-2026-79748 — MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP…¶
Key facts
CVE-2026-79748 is a Critical (9.9) vulnerability: MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP…. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-79748 |
| Severity | Critical (9.9) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-79748/ |
Details¶
English | 한국어
Description¶
MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies. Prior to version 0.12.15, the POST /api/servers and PUT /api/servers/:name endpoints in MCPHub create/update MCP server configurations and then immediately spawn the configured stdio process via child_process.spawn. Authentication is required, but there is no authorization check restricting these endpoints to admins, and there is no allowlist/sanitization on the command and args fields. As a result, any authenticated non-admin user can submit a server configuration with command:"/bin/sh" (or any other binary) and arbitrary args, causing MCPHub to execute the attacker-controlled process as the MCPHub server's OS user (commonly root in the published Docker image and in npx/systemd deployments). This issue has been patched in version 0.12.15.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-79748 |
| CVSS Score | 9.9 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-79748/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-2026-79748
# 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://github.com/samanhappy/mcphub/pull/770
- https://github.com/samanhappy/mcphub/releases/tag/v0.12.15
- https://github.com/samanhappy/mcphub/security/advisories/GHSA-mx89-jjx9-gjr8
- https://github.com/samanhappy/mcphub/security/advisories/GHSA-mx89-jjx9-gjr8
Generated by PoC Generator on 2026-09-02T21:45:43.895575166
Frequently asked questions¶
What is CVE-2026-79748?¶
CVE-2026-79748 is a Critical (9.9) vulnerability: MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP…. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-79748?¶
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-2026-79748?¶
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.