{"id":"CVE-2026-49257","aliases":["GHSA-73cv-556c-w3g6","PYSEC-2026-410"],"url":"https://o3.security/vulnerability/CVE-2026-49257","summary":"mcp-pinot: Unauthenticated tool invocation via default oauth_enabled=False + host 0.0.0.0 bind","details":"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","published":"2026-06-18T21:01:10.984Z","modified":"2026-08-12T03:51:47.406016157Z","cvss":{"score":10,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},"epss":{"score":0.0093,"percentile":0.57332,"asOf":"2026-08-11"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"mcp-pinot-server","fixedVersion":"3.1.0"}],"fix":{"url":"https://github.com/startreedata/mcp-pinot/commit/1c7d3f9cd384854bf72c127d230bdb32299475ad","label":"startreedata/mcp-pinot@1c7d3f9"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49257.json"},{"type":"ADVISORY","url":"https://github.com/startreedata/mcp-pinot/security/advisories/GHSA-73cv-556c-w3g6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49257"},{"type":"REPORT","url":"https://github.com/startreedata/mcp-pinot/issues/90"},{"type":"FIX","url":"https://github.com/startreedata/mcp-pinot/commit/1c7d3f9cd384854bf72c127d230bdb32299475ad"},{"type":"FIX","url":"https://github.com/startreedata/mcp-pinot/pull/95"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:47.406016157Z"}}