---
id: CVE-2026-56702
title: >-
  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
summary: >-
  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 upl…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-434
published: '2026-08-25'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:23:49.880'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56702'
references:
  - url: 'https://github.com/vrana/adminer/security/advisories/GHSA-vcvj-rwwm-x6g5'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/adminer-before-unrestricted-file-upload-via-adminerfileupload
    label: disclosure@vulncheck.com
  - url: 'https://github.com/vrana/adminer/security/advisories/GHSA-vcvj-rwwm-x6g5'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00343
epssPercentile: 0.27887
ingestedAt: '2026-09-08T21:11:12.285Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.