CVE-2026-49257: CWE-306: Missing Authentication for Critical Function in startreedata mcp-pinot
mcp-pinot versions 3.0.1 and below run an unauthenticated HTTP MCP server bound to all interfaces, allowing any network-adjacent user to access critical functions such as SQL query execution, schema creation, and table configuration mutation. This leads to a confused-deputy vulnerability where the server uses its Pinot credentials to perform unauthorized read/write operations on the Pinot cluster. The issue is fixed in version 3.1.0.
AI Analysis
Technical Summary
The vulnerability CVE-2026-49257 in startreedata's mcp-pinot affects versions up to 3.0.1. The MCP server runs on 0.0.0.0:8080 without authentication, exposing all MCP tools to any network-adjacent caller. Because the server proxies requests using its own Pinot credentials, attackers can gain full read and write access to the configured Pinot cluster, resulting in a critical security breach. This is a classic CWE-306 (Missing Authentication for Critical Function) vulnerability. The flaw is resolved in version 3.1.0.
Potential Impact
An unauthenticated attacker on the network can execute any MCP tool function, including SQL queries, schema creation, and table configuration changes, with the server's full read/write privileges on the Pinot cluster. This compromises confidentiality, integrity, and availability of the Pinot data and services.
Mitigation Recommendations
Upgrade mcp-pinot to version 3.1.0 or later, where authentication is enforced for the MCP server. Until upgraded, restrict network access to the MCP server to trusted hosts only to reduce exposure. Patch status is confirmed fixed in 3.1.0.
CVE-2026-49257: CWE-306: Missing Authentication for Critical Function in startreedata mcp-pinot
Description
mcp-pinot versions 3.0.1 and below run an unauthenticated HTTP MCP server bound to all interfaces, allowing any network-adjacent user to access critical functions such as SQL query execution, schema creation, and table configuration mutation. This leads to a confused-deputy vulnerability where the server uses its Pinot credentials to perform unauthorized read/write operations on the Pinot cluster. The issue is fixed in version 3.1.0.
CVSS v3.1
Score 10.0critical
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-49257 in startreedata's mcp-pinot affects versions up to 3.0.1. The MCP server runs on 0.0.0.0:8080 without authentication, exposing all MCP tools to any network-adjacent caller. Because the server proxies requests using its own Pinot credentials, attackers can gain full read and write access to the configured Pinot cluster, resulting in a critical security breach. This is a classic CWE-306 (Missing Authentication for Critical Function) vulnerability. The flaw is resolved in version 3.1.0.
Potential Impact
An unauthenticated attacker on the network can execute any MCP tool function, including SQL queries, schema creation, and table configuration changes, with the server's full read/write privileges on the Pinot cluster. This compromises confidentiality, integrity, and availability of the Pinot data and services.
Mitigation Recommendations
Upgrade mcp-pinot to version 3.1.0 or later, where authentication is enforced for the MCP server. Until upgraded, restrict network access to the MCP server to trusted hosts only to reduce exposure. Patch status is confirmed fixed in 3.1.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-28T14:33:01.179Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a346115f198dc38c1910c65
Added to database: 6/18/2026, 9:20:21 PM
Last enriched: 6/18/2026, 9:35:03 PM
Last updated: 6/18/2026, 11:56:20 PM
Views: 11
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