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New MCP security tool finds trust boundaries, not prompt injection, are the real attack surface

A new security audit tool highlights that the primary attack surface for Machine Control Protocol (MCP) servers is not prompt injection, but rather the trust boundary where injected instructions translate into actual tool calls with machine privileges. The tool, built as an MCP server itself, scans for 21 common vulnerability patterns across multiple programming languages, many of which predate LLMs. Its key innovation is purpose-aware scoring, which prioritizes vulnerabilities based on their reachability through model-invoked tools, aiming to reduce false positives and focus on critical security flaws. AI

IMPACT Highlights critical security vulnerabilities in LLM-integrated systems, urging developers to focus on secure handler implementation.

RANK_REASON The item describes a new security audit tool for MCP servers.

Read on dev.to — MCP tag →

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New MCP security tool finds trust boundaries, not prompt injection, are the real attack surface

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  1. dev.to — MCP tag TIER_1 English(EN) · manja316 ·

    MCP's real attack surface isn't prompt injection — it's the trust boundary (21 patterns, 5 languages)

    <p>We keep talking about prompt injection like it's the endgame. It isn't. Prompt injection is step one. The actual damage happens one step later, at a place most MCP threat models barely mention: the <strong>trust boundary</strong> — the moment an injected instruction turns into…