by Kastro
Paper/Archive/CVE-2026-49257

CVE-2026-49257

startreedata mcp-pinot — mcp-pinot: Unauthenticated tool invocation via default oauth_enabled=False + host 0.0.0.0 bind

EPSS 0.6%public exploitCVSS 10.0
critical.is priorityof 100
50
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 49.8.498 × 2010.0Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

Affected

ProductAffectedFixed inSource
mcp-pinot< 3.1.0–CNA

Scores by source

GitHub_M (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/startreedata/mcp-pinot/security/advisories/GHSA-73cv-556c-w3g6refgithub.com/startreedata/mcp-pinot/issues/90refgithub.com/startreedata/mcp-pinot/pull/95refgithub.com/startreedata/mcp-pinot/commit/1c7d3f9cd384854bf72c127d230bdb32299475ad