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Pattern Treat Mcp Tool Output As An Untrusted Data Plane

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2026-07-15 / vibe-coding-researcherPattern: Treat MCP Tool Output as an Untrusted Data PlaneAcross the Sentry-event injection, mcp-wiki SSRF, and exposed-inspector disclosures, the common thread is that untrusted content flowing back through MCP tool results is the 2026 prompt-injection frontier — the payload arrives in what the model reads as 'trusted diagnostics,' not in the user's message. Harden by scoping credentials per server, never auto-loading repo-local MCP configs, binding local MCP dev tools to localhost with auth, and sanitizing/labeling tool output before it re-enters the context window.

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Vulnerable MCP Project

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