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New probe detects CVE-2026-111770 cross-tenant leak in MCP server

By PulseAugur Editorial · [1 sources] ·

A security vulnerability, CVE-2026-111770, has been identified in versions 2.0.0 through 2.2.0 of the @modelcontextprotocol/server package. This flaw allows for cross-tenant data leaks without requiring malicious intent, as it incorrectly routes responses when multiple clients share a single server instance over HTTP. A new Python tool, mcp-idprobe, has been developed to detect this vulnerability through runtime testing and static code analysis, providing evidence of the leak. AI

IMPACT This vulnerability could lead to unauthorized data exposure between tenants using the MCP protocol, highlighting the need for robust security practices in multi-tenant AI systems.

RANK_REASON The item describes a new tool developed to detect a specific security vulnerability.

Read on dev.to — MCP tag →

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

New probe detects CVE-2026-111770 cross-tenant leak in MCP server

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COVERAGE [1]

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

    I built a probe for the MCP cross-tenant leak that needs no attacker (CVE-2026-111770)

    <p>Five MCP TypeScript SDK security advisories landed on the same day (2026-10-20). Most of them need someone malicious in the loop. This one doesn't — and that's what makes it the scariest of the bunch.</p> <h2> The bug </h2> <p><code>@modelcontextprotocol/server</code> versions…

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