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CVE-2026-118235— SimpleForm <= 3.10.2 - Unauthenticated Arbitrary File Upload via Trailing-Dot Filename via Unknown File Key in simpleform_get_submit_data

Quick assessment

Affected
wpazleen SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications
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"SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications"在所有 3.10.2 及更早版本中，存在任意文件上传漏洞。该漏洞源于 handle_upload 函数中缺少服务器端文件密钥白名单以及前置的扩展名净化处理，导致攻击者可通过在文件名末尾添加点号（trailing-dot）来绕过 handle_upload 函数中的所有扩展名和 MIME 类型验证。这使得未认证攻击者能够上传可执行

CVSS 9.8 · Critical EPSS 0.74% · P55

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpazleen SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications ≤ 3.10.2 affected
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I. Basic Information for CVE-2026-118235

Vulnerability Information
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Vulnerability Title
SimpleForm <= 3.10.2 - Unauthenticated Arbitrary File Upload via Trailing-Dot Filename via Unknown File Key in simpleform_get_submit_data
Source: CVE Program / CVE List V5
Vulnerability Description
The SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.10.2 via the handle_upload function. This is due to missing server-side file key allowlist and pre-sanitization extension derivation that allows a trailing-dot filename to bypass all extension and MIME validation in handle_upload. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. The only access control is a nonce that is printed into every public form's data-nonce attribute, making it trivially obtainable by any unauthenticated visitor on a page embedding the form shortcode.
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
wpazleen SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications 0 ~ 3.10.2 -

II. Public POCs for CVE-2026-118235

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III. Intelligence Information for CVE-2026-118235

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Other References for CVE-2026-118235 (1)

Other References for CVE-2026-118235 (8)

IV. Related Vulnerabilities

Same product: SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications
Same vendor: wpazleen
Same weakness: CWE-434