First measurement study of 7,973 remote MCP servers finds 40.55% lack authentication and all 119 tested OAuth servers have flaws that risk data leaks or account takeover.
When MCP meets OAuth: Common pitfalls lead- ing to one-click account takeover
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A First Measurement Study on Authentication Security in Real-World Remote MCP Servers
First measurement study of 7,973 remote MCP servers finds 40.55% lack authentication and all 119 tested OAuth servers have flaws that risk data leaks or account takeover.