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MCP SDKs vulnerable to credential theft; patches require explicit issuer pinning

By PulseAugur Editorial · [1 sources] ·

A critical vulnerability in the Minecraft Control Protocol (MCP) SDKs allowed malicious servers to intercept OAuth credentials. The issue, reported by Cycode and WorkOS, stemmed from the SDKs failing to verify the OAuth issuer, enabling attackers to trick clients into sending sensitive information like client secrets. While patches exist for the MCP Python and Rust SDKs, simply upgrading is insufficient; users must explicitly configure trusted issuers to prevent exploitation. A proof-of-concept client demonstrates this vulnerability, highlighting the need for clients to verify their login providers before sharing credentials. AI

IMPACT Requires developers to pin OAuth issuers to prevent credential theft in MCP SDK integrations.

RANK_REASON The item discusses a specific vulnerability and its mitigation in a software development kit, which falls under tooling.

Read on dev.to — MCP tag →

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

MCP SDKs vulnerable to credential theft; patches require explicit issuer pinning

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13 / 100
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Tool
The item discusses a specific vulnerability and its mitigation in a software development kit, which falls under tooling.
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product, safety
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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) · Bobby Hall Jr ·

    Patching the MCP SDK Doesn't Fix It. Pin the OAuth Issuer in TypeScript.

    <p>An agent connects to an MCP server.</p> <p>The server says: you need to log in.</p> <p>So the client asks the server where to log in.</p> <p>That sounds normal.</p> <p>It is normal.</p> <p>It is also the problem.</p> <p>The client is asking a stranger for directions to its own…

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