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Vulnerability record · CVE-2026-49257 · published 18 June 2026

CVE-2026-49257: Missing authentication for critical function vulnerability

mcp-pinot is a Python-based Model Context Protocol (MCP) server for interacting with Apache Pinot. In versions 3.0.1 and below, mcp-pinot defaults to running an HTTP MCP server bound to 0.0.0.0:8080 with no authentication enabled. All MCP tools, including SQL query execution, schema creation, and table-config mutation, are reachable by any network-adjacent caller. The server proxies these calls using server-side Pinot credentials, producing a confused-deputy condition that yields full read/write access to the configured Pinot cluster. This issue has been fixed in version 3.1.0

10.0 CVSS 3.1 Critical EPSS 0.93% · top 41.0% CWE-306 · Missing authentication for critical function Deferred
10.0CVSS 3.1 base score
0.93%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
23 Jun 2026Last modified by NVD

Description

mcp-pinot is a Python-based Model Context Protocol (MCP) server for interacting with Apache Pinot. In versions 3.0.1 and below, mcp-pinot defaults to running an HTTP MCP server bound to 0.0.0.0:8080 with no authentication enabled. All MCP tools, including SQL query execution, schema creation, and table-config mutation, are reachable by any network-adjacent caller. The server proxies these calls using server-side Pinot credentials, producing a confused-deputy condition that yields full read/write access to the configured Pinot cluster. This issue has been fixed in version 3.1.0

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://github.com/startreedata/mcp-pinot/commit/1c7d3f9cd384854bf72c127d230bdb32299475ad
https://github.com/startreedata/mcp-pinot/issues/90
https://github.com/startreedata/mcp-pinot/pull/95
https://github.com/startreedata/mcp-pinot/security/advisories/GHSA-73cv-556c-w3g6
https://github.com/startreedata/mcp-pinot/security/advisories/GHSA-73cv-556c-w3g6

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Source: NIST National Vulnerability Database (record CVE-2026-49257), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.