MCP server for debugging MCP host/client custom header implementation, with a tool to inspect request headers.
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Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
express vulnerable to XSS via response.redirect()
Express.js Open Redirect in malformed URLs
[](https://m8ven.ai/mcp/matsjfunke-debug-test-mcp-xcgmp8)