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Seven Critical Security Flaws Developers Keep Shipping in Remote MCP Servers

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Security researchers are flagging recurring vulnerabilities in remote Model Context Protocol (MCP) servers, many of which are auto-generated from OpenAPI specs or no-code tools. The most common flaw is missing authentication — servers that return a tool list without an Authorization header are effectively open to anyone. OAuth 2.1 is the spec-recommended standard for HTTP transport protection, requiring S256 code challenges, yet many servers still expose weaker configurations. Audience validation failures allow servers to accept tokens not issued for them, effectively bypassing authorization and corrupting audit trails. A particularly costly tenant isolation bug lets one customer access another's data simply by swapping an ID in the request, because tenant identity is drawn from user input rather than a verified token claim.

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Seven Critical Security Flaws Developers Keep Shipping in Remote MCP Servers · ShortSingh