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MCP-Defender

Desktop app that automatically scans and blocks malicious MCP traffic in AI apps like Cursor, Claude, VS Code and Windsurf.

→ MCP-Defender/MCP-Defender· listed on github_topic
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// key findings
⚠️
Known vulnerabilities in dependencies: 21 high
Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
🔐
You'll be asked for 1 credential: OPENAI_API_KEY
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// known CVEs in dependencies21 high3 medium31 low

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

high@modelcontextprotocol/sdk@1.10.0GHSA-345p-7cg4-v4c7

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

high@modelcontextprotocol/sdk@1.10.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.10.0GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

highaxios@1.9.0GHSA-35jp-ww65-95wh

axios Vulnerable to Full Man-in-the-Middle via Prototype Pollution Gadget in `config.proxy`

highaxios@1.9.0GHSA-3g43-6gmg-66jw

axios Vulnerable to Credential Theft and Response Hijacking via Prototype Pollution Gadget in Config Merge

Depend on this server? Get alerted when its CVEs change.Watch this server free →
// required environment variables
This server reads these from process.env. You'll be asked to provide them before it can run.
configMAIN_WINDOW_VITE_DEV_SERVER_URL
configMAIN_WINDOW_VITE_NAME
configMCP_DEFENDER_APP_NAME
configMCP_DEFENDER_APP_PLATFORM
configMCP_DEFENDER_APP_VERSION
configMCP_DEFENDER_DISCOVERY_MODE
configMCP_DEFENDER_LOG_DIR
configMCP_DEFENDER_SERVER_NAME
configNPM_CONFIG_PREFIX
🔐 secretOPENAI_API_KEY
configSKIP_NOTARIZE
// full audit trail
The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.
// improvement guidance — verified publishers only
We have 4 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/mcp-defender-mcp-defender-5a6425)](https://m8ven.ai/mcp/mcp-defender-mcp-defender-5a6425)
commit: 7fa7e7571a22de10dc2af5d63d8874d7d682c2fa
code hash: bafe458af513ef873fdc6d8d95f38aaebdaaee7cab45ff5aeb0e7aa3ccce985c
verified: 6/14/2026, 10:41:19 AM
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