Yahoo Fantasy Baseball MCP Server

Item: Yahoo Fantasy Baseball MCP Server
Rating: 54
Author: M8ven

Manage your Yahoo Fantasy Baseball team via Claude — check rosters, scout free agents, set lineups, and pull advanced stats from Baseball Savant, FanGraphs, and MLB Stats API.

→ dingyiyi0226/fantasy-baseball-mcp · listed on glama

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// key findings

⚠️

Known vulnerabilities in dependencies: 18 high

Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.

✅

20 tools verified — handlers match their declared behaviour

1 read-only tool verified — handlers contain no write/delete/exec

✅

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: YF_CLIENT_SECRET

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

// known CVEs in dependencies18 high12 low

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

high@modelcontextprotocol/sdk@1.12.0GHSA-345p-7cg4-v4c7

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

high@modelcontextprotocol/sdk@1.12.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.12.0GHSA-w48q-cv73-mx4w

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

highaxios@1.7.0GHSA-35jp-ww65-95wh

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

highaxios@1.7.0GHSA-3g43-6gmg-66jw

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

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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.

configYF_CLIENT_ID— e =your_id -e YF_CLIENT_SECRET=your_secret \

🔐 secretYF_CLIENT_SECRET— e YF_CLIENT_ID=your_id -e =your_secret \

// 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 6 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/dingyiyi0226-fantasy-baseball-mcp-fbegs3)](https://m8ven.ai/mcp/dingyiyi0226-fantasy-baseball-mcp-fbegs3)

commit: 4e088b24711bebb83253ff6f0119c734774fb7d3

code hash: d9ebb43c05b4ae4f6ac27dfd7ef7fc07e373d7424f0c2498adb3d23072125e34

verified: 6/14/2026, 9:56:35 AM

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