Introducing MCPGrade: Securing Model Context Protocol Servers in 2026

BLUF / Executive Summary: Target: Model Context Protocol (MCP) HTTP/SSE Server endpoints. Discovery: Audit of 5,308 public MCP endpoints revealed 65% lack transport authentication . Solution: Introducing MCPGrade ( mcpgrade-1.4.0 ) , a 39-check rating algorithm. The Model Context Protocol (MCP) is now the standard for connecting AI models to tools and data. But as developers deploy MCP servers, security has lagged. In our audit of 5,308 public MCP servers under SentinelReign research, over 3,450 servers (65%) exposed tool execution capabilities without authentication. MCPGrade ( mcpgrade-1.4.0 ) Matrix Assessment Domain Checks Impact Weight 1. Transport Authentication 10 Checks 35% 2. Tool Scope & Authorization 12 Checks 30% 3. Input Validation & Injection 9 Checks 20% 4. Rate Limiting & Audit Logging 8 Checks 15% Check out the full teardown and live A-F scanner at Andrax Pentester . Written by Syed Zada Abrar — Founder & CEO of SentinelReign ( https://sentinelreign.com ).