Vulnerability · Published Aug 25, 2026 · Assigned by VulnCheck

CVE-2026-56702Adminer before 5.4.3 Unrestricted File Upload via AdminerFileUpload

High 8.8

In plain English

A high-severity unrestricted file upload in adminer from vrana. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.6%top 50.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	adminer	no fix listed	DEBIAN-CVE-2026-56702
Debian:13	adminer	no fix listed	DEBIAN-CVE-2026-56702
Debian:14	adminer	5.4.3+dfsg-1	DEBIAN-CVE-2026-56702
Ubuntu:22.04:LTS	adminer	no fix listed	UBUNTU-CVE-2026-56702
Ubuntu:24.04:LTS	adminer	no fix listed	UBUNTU-CVE-2026-56702
Ubuntu:26.04:LTS	adminer	no fix listed	UBUNTU-CVE-2026-56702

Affected products (as reported)

Vendor	Product	Versions
vrana	adminer	0 – before 5.4.3

Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-vcvj-rwwm-x6g5) vendor-advisory
VulnCheck Advisory: Adminer before 5.4.3 Unrestricted File Upload via AdminerFileUpload third-party-advisory