CVE-2026-56705: External Control of File Name or Path in vrana adminer
Description
Adminer versions before 5.4.3 contain a vulnerability where the server field is not properly sanitized before constructing a PDO DSN string. This allows unauthenticated attackers to inject ODBC parameters via semicolons, including TraceFile and TraceOn, which can be used to write PHP code to the web root and achieve remote code execution.
CVSS v4.0
Score 9.3critical
Affected software
vrana
adminer
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-56705 affects Adminer prior to version 5.4.3. The vulnerability arises from improper sanitization of the server field used in constructing a PDO DSN string. Attackers can inject ODBC parameters such as TraceFile and TraceOn through semicolon-separated values. By leveraging these parameters, attackers can write arbitrary PHP code to the web root directory. When the trace file is accessed, this results in remote code execution without requiring authentication.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary PHP code on the server hosting Adminer. This can lead to full system compromise, data theft, or further attacks within the network. The vulnerability has a CVSS 4.0 base score of 9.3, indicating critical severity with network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
A fix is available in Adminer version 5.4.3 and later. Users should upgrade to version 5.4.3 or newer to remediate this vulnerability. Until patched, restricting access to Adminer and monitoring for suspicious activity may reduce risk, but upgrading is the recommended action.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-22T18:48:27.059Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8cf57aacd9273b4984286b
Added to database: 08/25/2026, 01:52:58 UTC
Last enriched: 09/10/2026, 08:07:07 UTC
Last updated: 10/08/2026, 18:48:46 UTC
Views: 75
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