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CVE-2026-94589— Extensions For CF7 (Contact form 7 Database, Conditional Fields and Redirection) <= 3.4.5 - Unauthenticated Arbitrary File Upload via Signature Field File Upload

Quick assessment

Affected
htplugins Extensions For CF7 (Contact form 7 Database, Conditional Fields and Redirection)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 Extensions For CF7（支持 Contact Form 7 数据库、条件字段和重定向功能）在所有版本（包括 3.4.5 及更早版本）中存在任意文件上传漏洞，该漏洞通过 extcf7_submit 函数触发。此问题源于在 signature 字段的 validation_filter() 验证逻辑中，未对文件扩展名、MIME 类型和文件大小进行充分验证，同时上传目录缺乏阻止 PHP 代码执行的防护措施，并且存在绕过 sanitize_file_name() 函数的缺陷，可将形如

CVSS 9.8 · Critical
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I. Basic Information for CVE-2026-94589

Vulnerability Information
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Vulnerability Title
Extensions For CF7 (Contact form 7 Database, Conditional Fields and Redirection) <= 3.4.5 - Unauthenticated Arbitrary File Upload via Signature Field File Upload
Source: CVE Program / CVE List V5
Vulnerability Description
The Extensions For CF7 (Contact form 7 Database, Conditional Fields and Redirection) plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.4.5 via the extcf7_submit function. This is due to missing file extension, MIME type, and size validation in the signature field's validation_filter(), combined with the absence of PHP-execution guards in the upload directory and a sanitize_file_name() bypass that converts shell.php- into shell.php. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
htplugins Extensions For CF7 (Contact form 7 Database, Conditional Fields and Redirection) 0 ~ 3.4.5 -

II. Public POCs for CVE-2026-94589

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III. Intelligence Information for CVE-2026-94589

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Other References for CVE-2026-94589 (7)

IV. Related Vulnerabilities

Same product: Extensions For CF7 (Contact form 7 Database, Conditional Fields and Redirection)
Same vendor: htplugins
Same weakness: CWE-434

V. Comments for CVE-2026-94589

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