A 2025 internet scan found nearly 2,000 unauthenticated public MCP instances, and 53% of deployed servers still rely on insecure long-lived API keys. This guide breaks down why OAuth 2.1 with PKCE is mandatory for remote MCP deployments, plus actionable zero-trust controls to secure agentic workflows at scale.
A July 2025 internet scan found at least 1,862 publicly accessible MCP instances responding to unauthenticated requests — and that was before the protocol hit mainstream adoption. Today the attack surface is exponentially larger.
The Security Crisis in Remote MCP Deployments
The Model Context Protocol has become the connective tissue of agentic automation in under 18 months. But the security posture of most deployments hasn't caught up.
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