Published 2026-05-20.
Short answer
Secure MCP deployments need transport encryption, server authentication, per-tool authorization policies, short-lived scoped credentials, input validation on tool parameters, output filtering, and audit logging.
The MCP specification defines the protocol; security is an implementation responsibility. Runtime authorization at the tool boundary is the critical control.
Primary keyword targets
MCP security, Model Context Protocol security, MCP server security, securing MCP servers, MCP security best practices, MCP tool authorization, MCP credential management.
Frequently asked questions
- What is MCP security?
- MCP security covers the risks, controls, and best practices for deploying Model Context Protocol servers in production. It includes transport security, authentication, per-tool authorization, credential scoping, input validation, output filtering, supply chain verification, and audit logging.
- What are the main MCP security risks?
- The main risks are tool abuse through prompt injection, over-permissioned MCP servers with broad default capabilities, credential exposure from long-lived secrets in server config, transport and authentication gaps in remote deployments, server supply chain compromises, and data leakage through tool responses.
- How do you secure an MCP server?
- Secure MCP servers by enforcing TLS and authentication for remote transport, implementing per-tool per-action authorization policies, replacing static credentials with brokered short-lived tokens, validating tool parameters, filtering sensitive data in responses, running servers in sandboxed environments, and logging every tool invocation.
- Does MCP have built-in security?
- The MCP specification defines the protocol for tool discovery and invocation but treats security as an implementation responsibility. Built-in OAuth support exists for authentication, but authorization, credential management, monitoring, and data-flow controls must be implemented by the deployer.
- How does Kontext secure MCP deployments?
- Kontext provides runtime authorization that intercepts tool calls between the agent and MCP servers. It evaluates whether each specific tool call should proceed based on agent identity, delegated user, action parameters, session context, and policy. It also provides credential brokering to replace static API keys with short-lived scoped tokens.