MCP Protocol Drops Sessions in July 2026 Update, Raising Prompt Injection Risks

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The July 28, 2026 revision of the Model Context Protocol eliminates the initialize handshake, Mcp-Session-Id header, and server-side session state, making every request fully stateless. The change allows MCP servers to run behind standard load balancers without sticky sessions or shared session stores, simplifying scaling significantly. In place of session-based continuity, the spec introduces explicit handles — strings the model carries in its context window and passes as arguments on subsequent calls. However, security concerns have emerged because these handles are ordinary strings that can be read, copied, or injected by anyone able to plant text the model trusts, effectively turning a planted prompt into a stolen credential. Server authors are advised to implement per-request validation checks, as the assumption that credentials are tied to transport-level session metadata no longer holds under the new spec.

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