CVE-2026-59971Network attack vectorHinoki check available

Unauthenticated SQL execution via unprotected SSE routes

Published Sep 15, 2026 · Updated Sep 15, 2026

Missing authentication in MySQL MCP Server before 0.4.2 allows remote attackers to execute arbitrary SQL through the SSE transport. server.py constructs SseServerTransport without security settings, leaves three Starlette routes unauthenticated, and passes attacker-controlled queries to cursor.execute. Exposure requires SSE mode; stdio is unaffected, and file access or code execution additionally requires MySQL FILE privileges.

CVSS severity10.0
Critical
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authentication in MySQL MCP Server before 0.4.2 allows remote attackers to execute arbitrary SQL through the SSE transport. server.py constructs SseServerTransport without security settings, leaves three Starlette routes unauthenticated, and passes attacker-controlled queries to cursor.execute. Exposure requires SSE mode; stdio is unaffected, and file access or code execution additionally requires MySQL FILE privileges.

The record

CVE
CVE-2026-59971
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Design Computer LLC
Product
MySQL MCP Server
Classifications
CWE-306, CWE-346, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Design Computer LLC · MySQL MCP Serverversion=< 0.4.2

Published CVSS scores

10.0GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-346Origin Validation Error
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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