Vulnerability · Published Jun 18, 2026 · Assigned by GitHub_M
CVE-2026-49257mcp-pinot: Unauthenticated tool invocation via default oauth_enabled=False + host 0.0.0.0 bind
Critical 10.0
In plain English
A critical-severity missing authentication in mcp-pinot from startreedata. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | mcp-pinot-server | 3.1.0 | GHSA-73cv-556c-w3g6 |
| PyPI | mcp-pinot-server | 3.1.0 | PYSEC-2026-410 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| startreedata | mcp-pinot | < 3.1.0 |
Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
References
- https://github.com/startreedata/mcp-pinot/security/advisories/GHSA-73cv-556c-w3g6 x_refsource_CONFIRM
- https://github.com/startreedata/mcp-pinot/issues/90 x_refsource_MISC
- https://github.com/startreedata/mcp-pinot/pull/95 x_refsource_MISC
- https://github.com/startreedata/mcp-pinot/commit/1c7d3f9cd384854bf72c127d230bdb32299475ad x_refsource_MISC