High severity · published Aug 25, 2026
CVE-2026-56702
Adminer before 5.4.3 Unrestricted File Upload via AdminerFileUpload
8.8
CVSS
0.6%
EPSS
No
On KEV
Description
Adminer versions before 5.4.3 contain an unrestricted file upload vulnerability in the AdminerFileUpload plugin that allows authenticated users to upload PHP files by exploiting a permissive default extension allowlist. Attackers can upload PHP webshells to columns ending in _path and execute arbitrary code as the web-server user when uploadPath is web-served.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% 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-2026-56702
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56702
github.com
https://github.com/vrana/adminer/security/advisories/GHSA-vcvj-rwwm-x6g5
www.vulncheck.com
https://www.vulncheck.com/advisories/adminer-before-unrestricted-file-upload-via-adminerfileupload
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