What’s Vulnerable › Vulnerabilities

CVE-2026-49257: mcp-pinot: Unauthenticated tool invocation via default oauth_enabled=False + host 0.0.0.0 bind

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-18 · updated 2026-10-26
• Weakness: CWE-306

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 products

• startreedata mcp-pinot: before 3.1.0

References

• 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

Get alerted when CVE-2026-49257 or the next vulnerability affects your stack