Google Calendar MCP Server

Enables Claude to interact with Google Calendar through natural language, providing the ability to view, create, update, and delete calendar events with persistent OAuth2 authentication.

→ naotaka3/google-calendar-mcp · listed on glama

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// key findings

⚠️

Known vulnerabilities in dependencies: 2 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 2 credentials: GOOGLE_CLIENT_SECRET, TOKEN_ENCRYPTION_KEY

These are read from process.env at runtime. Make sure you trust where they’ll be sent.

// known CVEs in dependencies2 high2 low

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

high@modelcontextprotocol/sdk@1.8.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.8.0GHSA-w48q-cv73-mx4w

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

lowexpress@4.18.2GHSA-qw6h-vgh9-j6wx

express vulnerable to XSS via response.redirect()

lowexpress@4.18.2GHSA-rv95-896h-c2vc

Express.js Open Redirect in malformed URLs

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// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

configAUTH_HOST

configAUTH_PORT— You can customize the authentication server port with "": "4153" (default is 4153)

configGOOGLE_CLIENT_ID— your_client_id

🔐 secretGOOGLE_CLIENT_SECRET— your_client_secret

configGOOGLE_REDIRECT_URI— "": "http://localhost:4153/oauth2callback"

configHOST

configPORT

🔐 secretTOKEN_ENCRYPTION_KEY— =your_64_character_hex_string

configUSE_MANUAL_AUTH— If you're running in an environment where localhost is not accessible (e.g., remote server or container), add "": "true" to enable manual code entry

// 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/naotaka3-google-calendar-mcp-vz5pcv)](https://m8ven.ai/mcp/naotaka3-google-calendar-mcp-vz5pcv)

commit: 8465f58ac4e1ad1e20d8b5a77f8f6b917e8739d8

code hash: 4d98f776f73bce898e8644f38a797802105cf5f2e33b620deef6ad7201821efe

verified: 6/18/2026, 11:44:12 AM

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