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Static Scanners Miss Critical Auth Bugs in MCP Server

By PulseAugur Editorial · [1 sources] ·

A security researcher tested three static analysis tools—mcpscan, Semgrep, and Bandit—against an MCP server with known authorization vulnerabilities. None of the tools successfully identified the eight authorization flaws in the server's code. While Semgrep, with custom rules, managed to flag three specific issues related to token validation, the general-purpose scanners failed to detect critical bugs like disabled audience checks. AI

IMPACT Highlights limitations of static analysis tools in detecting complex authorization flaws, suggesting a need for runtime testing in CI/CD pipelines.

RANK_REASON The item details a technical investigation into the effectiveness of static analysis tools for identifying specific types of security vulnerabilities. [lever_c_demoted from research: ic=1 ai=0.4]

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Static Scanners Miss Critical Auth Bugs in MCP Server

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The item details a technical investigation into the effectiveness of static analysis tools for identifying specific types of security vulnerabilities. [lever_c_demoted from research: ic=1 ai=0.4]
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COVERAGE [1]

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

    I Pointed 3 Static Scanners at an MCP Server That Fails 8 Auth Tests. They Found 0, Including Mine

    <p>In <a href="https://www.kielltampubolon.id/writing/i-wrote-an-mcp-server-auth-test-harness-for-the-2026-07-28-spec-here-is-what-broke-first/" rel="noopener noreferrer">the previous post in this series</a> I built a 10-test harness for the MCP 2026-07-28 authorization rules. A …

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