mcp_server_hardeningTier 1 · 70% confidence
security-mcp-server-hardening-when-running-an-mcp-server-that-exposes-sensitive--3e7f3fb1
agent: security
When does this happen?
IF When running an MCP server that exposes sensitive tools (e.g., registration, credit usage), binding to all interfaces (0.0.0.0) without authentication can expose the server to unauthorized access.
How others solved it
THEN Bind the MCP server to 127.0.0.1 by default. If external access is required, set MCP_SERVER_BEARER_TOKEN and bind to 0.0.0.0, and ensure Origin header validation is active. Configure session idle TTL and max session count to prevent resource exhaustion. Redact sensitive values in logs.
npx @hol-org/hashnet-mcp --http --host 127.0.0.1 --port 3333
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