Polar MCP Server

Item: Polar MCP Server
Rating: 52
Author: M8ven

An MCP server for the Polar AccessLink API. Connect your Polar fitness data to Claude AI - access workouts, sleep analysis, recovery metrics, heart rate data, and more.

→ NelsonNew/polar-mcp-server · listed on glama

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// key findings

⚠️

Known vulnerabilities in dependencies: 7 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.

🔐

You'll be asked for 2 credentials: POLAR_ACCESS_TOKEN, POLAR_CLIENT_SECRET

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

// known CVEs in dependencies7 high3 medium21 low

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

high@hono/node-server@1.19.6GHSA-wc8c-qw6v-h7f6

@hono/node-server has authorization bypass for protected static paths via encoded slashes in Serve Static Middleware

high@modelcontextprotocol/sdk@1.24.2GHSA-345p-7cg4-v4c7

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

high@modelcontextprotocol/sdk@1.24.2GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

highhono@4.10.7GHSA-3vhc-576x-3qv4

Hono JWK Auth Middleware has JWT algorithm confusion when JWK lacks "alg" (untrusted header.alg fallback)

highhono@4.10.7GHSA-f67f-6cw9-8mq4

Hono JWT Middleware's JWT Algorithm Confusion via Unsafe Default (HS256) Allows Token Forgery and Auth Bypass

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.

🔐 secretPOLAR_ACCESS_TOKEN— "": "your_access_token"

configPOLAR_CLIENT_ID— npx wrangler secret put

🔐 secretPOLAR_CLIENT_SECRET— npx wrangler secret put

configPOLAR_USER_ID

// 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 7 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/nelsonnew-polar-mcp-server-18cq1n)](https://m8ven.ai/mcp/nelsonnew-polar-mcp-server-18cq1n)

commit: 9b3fe24b30133d993a34470388255d0355cc0f2e

code hash: 3c757fbedb9dd40feae19699f7533102c96931d2a4b911d131ad989f64bc194c

verified: 6/11/2026, 12:11:48 PM

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