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CVE-2026-109384— The Innovative Form Builder <= 1.5.1 - Authenticated (Custom+) Arbitrary File Upload via 'allowedFileExtensions' Configuration + Public /form/submission/ Multipart Upload

Quick assessment

Affected
melograno The Innovative Form Builder – IvyForms
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"The Innovative Form Builder – IvyForms"在所有 1.5.1 及以下版本中存在任意文件上传漏洞，该漏洞源于 函数。具体原因包括：允许的文件扩展名清理器中缺少对危险扩展名的黑名单，以及通过注册的 过滤器故意绕过了 WordPress 原生的 MIME 类型和扩展名防护机制。这使得拥有自定义级别及以上权限的已认证攻击者能够上传可能可执行的文件，从而实现远程代码执行（RCE）。 攻击流程如下：具备 自定义能力的已认证攻击者需先在“允许扩展名”列表中配置一个包含

CVSS 8.8 · High
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I. Basic Information for CVE-2026-109384

Vulnerability Information
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Vulnerability Title
The Innovative Form Builder <= 1.5.1 - Authenticated (Custom+) Arbitrary File Upload via 'allowedFileExtensions' Configuration + Public /form/submission/ Multipart Upload
Source: CVE Program / CVE List V5
Vulnerability Description
The The Innovative Form Builder – IvyForms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.5.1 via the filterFiletypeAndExt function. This is due to insufficient file type validation due to the absence of a dangerous-extension denylist in the allowed-extensions sanitizer and deliberate override of WordPress's native MIME and extension defences via a registered wp_check_filetype_and_ext filter. This makes it possible for authenticated attackers, with custom-level access and above, to upload files that may be executable, which makes remote code execution possible. An authenticated attacker with the custom add_edit_forms capability must first configure a File Upload field with a dangerous extension (e.g., php) in the allowed-extensions list; once that form is published, any unauthenticated visitor can trigger the actual file upload via the publicly accessible /wp-json/ivyforms/v1/form/submission/ REST route.
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
melograno The Innovative Form Builder – IvyForms 0 ~ 1.5.1 -

II. Public POCs for CVE-2026-109384

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III. Intelligence Information for CVE-2026-109384

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Other References for CVE-2026-109384 (7)

IV. Related Vulnerabilities

Same vendor: melograno
Same weakness: CWE-434