Which products and versions are affected by CVE-2026-49257?

Affected: mcp-pinot-server (pypi); mcp-pinot. The full list is in the CVE brief.

Is CVE-2026-49257 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2026-49257 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2026-49257?

Public exploit code is available.

Is there a fix for CVE-2026-49257?

Fixed versions are available, including mcp-pinot 3.1.0, mcp-pinot-server 3.1.0.

How urgently should CVE-2026-49257 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

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Vulnerability Intelligence

CVE-2026-49257

CriticalPublic exploit

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.

Published Jun 18, 2026 · Updated Oct 9, 2026 · Also known as EUVD-2026-37951, GHSA-73cv-556c-w3g6, PYSEC-2026-410

Key Facts

Patch immediately

CVE-2026-49257 is a critical-severity vulnerability (CVSS 10.0 v3.1) affecting mcp-pinot-server (pypi), mcp-pinot.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 0.9% probability of exploitation in the next 30 days.
Fixed versions are available, including mcp-pinot 3.1.0, mcp-pinot-server 3.1.0.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

CVSS v3.1

10.0

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

0.9%

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2026-49257 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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

2 affected entries in total

Product	Affected versions	Fixed in
mcp-pinot-serverpypi	See advisory	3.1.0
mcp-pinot	See advisory	3.1.0

Patched Releases

mcp-pinot

3.1.0

mcp-pinot-server

3.1.0

Timeline

Publicly disclosed
Jun 18, 2026
Last updated
Oct 9, 2026

Weakness Type

CWE-306 Missing Authentication for Critical Function

References

4 more references in the full CVE brief

FAQ

Common Questions.

mcp-pinot is a Python-based Model Context Protocol (MCP) server for interacting with Apache Pinot.
Affected: mcp-pinot-server (pypi); mcp-pinot. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including mcp-pinot 3.1.0, mcp-pinot-server 3.1.0.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

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