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Developer tests reveal critical security flaws in upcoming MCP protocol spec

By PulseAugur Editorial · [1 sources] ·

A developer created a test harness for the upcoming 2026-07-28 specification of the MCP protocol, which standardizes HTTP server authorization to resemble OAuth 2.1. The harness, consisting of ten tests, revealed significant security vulnerabilities in a typical implementation, with a "naive" server passing only two tests by default. A "hardened" version of the server, incorporating fixes for audience validation, metadata discovery, and token forwarding, successfully passed all ten tests, highlighting the ease with which critical security flaws can be addressed. AI

IMPACT Highlights potential security vulnerabilities in emerging authorization standards, impacting developers and system integrators.

RANK_REASON Developer-created test harness for a protocol specification.

Read on dev.to — MCP tag →

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

Developer tests reveal critical security flaws in upcoming MCP protocol spec

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7 / 100
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Developer-created test harness for a protocol specification.
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product, other
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Standard
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Breaking (< 6h)
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COVERAGE [1]

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

    I Wrote an MCP Server Auth Test Harness for the 2026-07-28 Spec. Here Is What Broke First

    <p>The MCP 2026-07-28 revision makes authorization for HTTP servers look a lot like ordinary OAuth: the server is a resource server, it publishes metadata, it validates audience, and it never forwards the client's token. That's good news, because "ordinary OAuth" is something we …

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