CVE-2026-56702: Unrestricted Upload of File with Dangerous Type in vrana adminer
Adminer versions prior to 5.4.3 have an unrestricted file upload vulnerability in the AdminerFileUpload plugin. Authenticated users can upload PHP files due to a permissive default extension allowlist. This allows attackers to upload PHP webshells to database columns ending with _path and execute arbitrary code as the web-server user if the upload path is web-accessible.
AI Analysis
Technical Summary
CVE-2026-56702 describes an unrestricted file upload vulnerability in the AdminerFileUpload plugin of Adminer before version 5.4.3. The vulnerability arises from a permissive default extension allowlist that permits authenticated users to upload PHP files. Attackers can exploit this to upload PHP webshells to columns ending in _path and execute arbitrary code with the privileges of the web server user when the upload path is served by the web server.
Potential Impact
Successful exploitation allows authenticated attackers to upload and execute arbitrary PHP code on the server, potentially leading to full compromise of the web server environment under the web-server user privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict authenticated user permissions and avoid serving upload paths via the web server to reduce risk.
CVE-2026-56702: Unrestricted Upload of File with Dangerous Type in vrana adminer
Description
Adminer versions prior to 5.4.3 have an unrestricted file upload vulnerability in the AdminerFileUpload plugin. Authenticated users can upload PHP files due to a permissive default extension allowlist. This allows attackers to upload PHP webshells to database columns ending with _path and execute arbitrary code as the web-server user if the upload path is web-accessible.
CVSS v4.0
Score 7.1high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-56702 describes an unrestricted file upload vulnerability in the AdminerFileUpload plugin of Adminer before version 5.4.3. The vulnerability arises from a permissive default extension allowlist that permits authenticated users to upload PHP files. Attackers can exploit this to upload PHP webshells to columns ending in _path and execute arbitrary code with the privileges of the web server user when the upload path is served by the web server.
Potential Impact
Successful exploitation allows authenticated attackers to upload and execute arbitrary PHP code on the server, potentially leading to full compromise of the web server environment under the web-server user privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict authenticated user permissions and avoid serving upload paths via the web server to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-22T18:48:27.059Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a8cf578acd9273b49842850
Added to database: 08/25/2026, 01:52:56 UTC
Last enriched: 08/25/2026, 02:22:05 UTC
Last updated: 08/25/2026, 02:32:14 UTC
Views: 3
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