CVE-2026-56705: Adminer before 5.4.3 Remote Code Execution via MSSQL PDO DSN Injection

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-25 · updated 2026-10-12
Weakness: CWE-73

Description

Adminer before 5.4.3 fails to sanitize the server field before constructing a PDO DSN string, allowing unauthenticated attackers to inject ODBC parameters via semicolons. Attackers can inject TraceFile and TraceOn parameters to write PHP code to the web root, achieving remote code execution when the trace file is accessed.

Affected products

vrana adminer: before 5.4.3 — fixed in 5.4.3

How to fix

Upgrade to a fixed version: vrana adminer 5.4.3. Check the vendor advisory for mitigations.

References

https://github.com/vrana/adminer/security/advisories/GHSA-r4x9-5m63-3vxw
https://www.vulncheck.com/advisories/adminer-before-remote-code-execution-via-mssql-pdo-dsn-injection
https://github.com/vrana/adminer/security/advisories/GHSA-r4x9-5m63-3vxw

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