CVE-2026-85788

File disclosure via inline-comment read-only bypass

Published Sep 9, 2026 · Updated Sep 9, 2026

Incomplete input filtering in the SQL detector in AWS Labs MySQL MCP Server 1.0.21 and earlier allows context-dependent attackers to read files. The detector matches raw SQL with patterns requiring literal whitespace, while MySQL treats inline comments as whitespace, so file-access statements evade the read-only gate. Exploitation requires a client-influenced SQL string, user interaction through the driving LLM, and a database account with FILE privilege; exposure is limited to files accessible to MySQL.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incomplete input filtering in the SQL detector in AWS Labs MySQL MCP Server 1.0.21 and earlier allows context-dependent attackers to read files. The detector matches raw SQL with patterns requiring literal whitespace, while MySQL treats inline comments as whitespace, so file-access statements evade the read-only gate. Exploitation requires a client-influenced SQL string, user interaction through the driving LLM, and a database account with FILE privilege; exposure is limited to files accessible to MySQL.

The record

CVE
CVE-2026-85788
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Amazon Web Services
Product
AWS Labs MySQL MCP Server
Classifications
CWE-184, CAPEC-43, T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=1.0.21

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Amazon Web Services · AWS Labs MySQL MCP Serverversion=0 <=1.0.21

Published CVSS scores

5.5GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
CAPEC-43Exploiting Multiple Input Interpretation Layers
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo