CVE-2026-56705Public exploitNetwork attack vector

Unauthenticated code execution via MSSQL DSN injection

Published Aug 25, 2026 · Updated Aug 25, 2026

Remote code execution in Adminer before 5.4.3 allows remote attackers to execute PHP code through a crafted MSSQL server field. The mssql.inc.php PDO attach method interpolates the server host into a sqlsrv DSN, so semicolons append TraceFile and TraceOn options. With pdo_sqlsrv, the Microsoft ODBC driver, and a web-writable document root, a failed unauthenticated login writes attacker-controlled PHP for later execution.

CVSS severity9.3
Critical
EPSS probability0.50%
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

Remote code execution in Adminer before 5.4.3 allows remote attackers to execute PHP code through a crafted MSSQL server field. The mssql.inc.php PDO attach method interpolates the server host into a sqlsrv DSN, so semicolons append TraceFile and TraceOn options. With pdo_sqlsrv, the Microsoft ODBC driver, and a web-writable document root, a failed unauthenticated login writes attacker-controlled PHP for later execution.

The record

CVE
CVE-2026-56705
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Adminer
Product
Adminer
Classifications
CWE-73, CWE-88, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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 <5.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Adminer · Adminerversion=0 <5.4.3

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8AdminerCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-73External Control of File Name or Path
CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1190Exploit Public-Facing Application

Public exploit references

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