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MCP Gateways Exhibit Authorization Drift Vulnerability

A security vulnerability has been identified where two authenticated MCP gateways can disagree on authorization, leading to potential security breaches. This issue arises when both an internal IAM gateway and an external OAuth gateway expose the same database tool, with one gateway incorrectly rejecting a cross-tenant filter while the other accepts it. To mitigate this, it is recommended to use a single versioned contract that defines capabilities, tenant scope, tool arguments, and resource limits, and to rigorously test this contract against various scenarios including cross-tenant requests and policy rollouts. AI

IMPACT Highlights potential security risks in distributed authorization systems, impacting developers and security professionals.

RANK_REASON Security vulnerability in a specific software component (MCP gateways).

Read on dev.to — MCP tag →

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

MCP Gateways Exhibit Authorization Drift Vulnerability

COVERAGE [1]

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

    Two authenticated MCP gateways can still disagree about authorization

    <p>An internal IAM gateway and an external OAuth gateway expose the same database tool.</p> <p>Both authenticate correctly.</p> <p>One rejects a cross-tenant filter. The other accepts it.</p> <p>That is authorization drift.</p> <p>Use one versioned contract for:</p> <ul> <li>stab…