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CVE-2026-5718— Drag and Drop Multiple File Upload for Contact Form 7 <= 1.3.9.7 - Unauthenticated Arbitrary File Upload via Non-ASCII Filename Blacklist Bypass

Quick assessment

Affected
glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7
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.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Drag and Drop Multiple File Upload for Contact Form 7 1.3.9.6及之前版本存在安全漏洞，该漏洞源于文件类型验证不足和绕过文件名清理函数，可能导致未经验证的攻击

CVSS 8.1 · High EPSS 3.46% · P89

Public Exploits 1

Nuclei · 1 CVE-2026-5718.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7 ≤ 1.3.9.7 affected
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I. Basic Information for CVE-2026-5718

Vulnerability Information
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Vulnerability Title
Drag and Drop Multiple File Upload for Contact Form 7 <= 1.3.9.7 - Unauthenticated Arbitrary File Upload via Non-ASCII Filename Blacklist Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.7. This is due to insufficient file type validation that occurs when custom blacklist types are configured, which replaces the default dangerous extension denylist instead of merging with it, and the wpcf7_antiscript_file_name() sanitization function being bypassed for filenames containing non-ASCII characters. This makes it possible for unauthenticated attackers to upload arbitrary files, such as PHP files, to the server, which can be leveraged to achieve remote code execution. The vulnerability was originally reported by Leonid Semenenko (lsemenenko) and partially patched in version 1.3.9.7. A bypass for the patch was separately discovered and reported by Nguyen Hung (Mitchell).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/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
Vulnerability Title
WordPress plugin Drag and Drop Multiple File Upload for Contact Form 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Drag and Drop Multiple File Upload for Contact Form 7 1.3.9.6及之前版本存在安全漏洞，该漏洞源于文件类型验证不足和绕过文件名清理函数，可能导致未经验证的攻击
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7 0 ~ 1.3.9.7 -

II. Public POCs for CVE-2026-5718

# POC Description Source Link Shenlong Link
1 Drag and Drop Multiple File Upload for Contact Form 7 WordPress plugin <= 1.3.9.6 contains an unrestricted file upload caused by insufficient file type validation and bypass of filename sanitization with non-ASCII characters, letting unauthenticated attackers upload arbitrary files and achieve remote code execution. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-5718.yaml POC Details
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III. Intelligence Information for CVE-2026-5718

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Patches & Fixes for CVE-2026-5718 (1)

IV. Related Vulnerabilities

Same product: Drag and Drop Multiple File Upload for Contact Form 7
Same vendor: glenwpcoder
Same weakness: CWE-434

V. Comments for CVE-2026-5718

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