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Critical mcp-pinot flaw (CVSS 10.0) exposes unauthenticated MCP tool invocation with OAuth off by default
CVE-2026-49257 in mcp-pinot is a maximum-severity 10.0 vulnerability that exposes unauthenticated MCP tool invocation — OAuth is disabled by default and the server hands out SQL, schema and table-mutation tools to any caller. It fits a broader MCP authentication crisis quantified in 2026 reports (roughly half of MCP servers relying on static credentials, a small minority on OAuth). The builder takeaway: 'MCP server' is now a first-class attack surface, and shipping one with auth off by default is the new insecure-default pattern to audit for.
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