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Sunday, 13 September 2026
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Incident database

CVE-2026-49257: mcp-pinot MCP server exposes unauthenticated Pinot access

mcp-pinot, a Python Model Context Protocol server for Apache Pinot, defaulted in versions 3.0.1 and below to an HTTP MCP server bound to 0.0.0.0:8080 with no authentication, letting any network-adjacent caller invoke all MCP tools. Because the server proxies calls with server-side Pinot credentials, this confused-deputy condition granted full read/write access to the configured Pinot cluster; it was fixed in version 3.1.0.

Disclosed 18 June 2026 · Record updated 13 September 2026

Impact

Unauthenticated network-adjacent callers could execute SQL queries, create schemas and mutate table configs, gaining full read/write access to the configured Apache Pinot cluster.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-49257