Critical severity · published Aug 25, 2026
CVE-2026-56705
Adminer before 5.4.3 Remote Code Execution via MSSQL PDO DSN Injection
9.8
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AD
adminer · vrana
before 5.4.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56705
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56705
github.com
https://github.com/vrana/adminer/security/advisories/GHSA-r4x9-5m63-3vxw
www.vulncheck.com
https://www.vulncheck.com/advisories/adminer-before-remote-code-execution-via-mssql-pdo-dsn-injection
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