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

Quick assessment

Affected
vrana adminer
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Adminer 5.4.3 之前版本中，AdminerFileUpload 插件存在一个不受限制的文件上传漏洞。攻击者可以通过利用宽松的默认扩展名允许列表，以认证用户身份上传 PHP 文件。如果 uploadPath 指向可被 Web 访问的目录，攻击者可以将 PHP WebShell 上传至以 结尾的字段列中，并以 Web 服务器用户的权限执行任意代码。

CVSS 8.8 · High EPSS 0.34% · P27

Affected Version Matrix 2

VendorProduct Version RangeStatus
vrana adminer < 5.4.3 affected
5.4.3 unaffected
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I. Basic Information for CVE-2026-56702

Vulnerability Information
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Vulnerability Title
Adminer before 5.4.3 Unrestricted File Upload via AdminerFileUpload
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vrana adminer 0 ~ 5.4.3 -

II. Public POCs for CVE-2026-56702

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6937 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-56702

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Vendor Advisories for CVE-2026-56702 (2)

Same Patch Batch · vrana · 2026-08-25 · 10 CVEs total

CVE-2026-56705 9.8 CRITICAL Adminer before 5.4.3 Remote Code Execution via MSSQL PDO DSN Injection
CVE-2026-34968 8.1 HIGH Adminer before 5.4.3 Arbitrary File Deletion via SQLite Drop
CVE-2026-56703 7.2 HIGH Adminer before 5.4.3 Remote Code Execution via SQLite VACUUM INTO
CVE-2026-56706 6.8 MEDIUM Adminer before 5.4.3 CSRF Token Secret Recovery via XOR Masking
CVE-2026-56704 6.1 MEDIUM Adminer before 5.4.3 Cross-Site Scripting via MySQL Version String
CVE-2026-34964 5.8 MEDIUM Adminer before 5.5.0 SSRF via PDO DSN Injection
CVE-2026-34967 5.4 MEDIUM Adminer sql-log Plugin 5.3.0 through 5.4.2 Arbitrary File Write
CVE-2026-34959 4.7 MEDIUM Adminer before 5.5.0 Open Redirect via X-Forwarded-Prefix
CVE-2026-16434 2.3 LOW Adminer before 5.5.1 X-Forwarded-Prefix Backslash Bypass

IV. Related Vulnerabilities

Same product: adminer
Same vendor: vrana
Same weakness: CWE-434

V. Comments for CVE-2026-56702

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