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

Q: Who is exposed to exploitation?

WordPress sites running SimpleForm version 3.10.2 or earlier are exposed if they have a publicly accessible page that embeds a SimpleForm shortcode. An unauthenticated visitor can obtain the required nonce from that form's data-nonce attribute.

Q: What does an attacker need to exploit this issue?

No account, privileges, or user interaction are required. The attacker needs access to a public page containing the form and can use a trailing-dot filename and an unrecognized file key to bypass the upload validation.

Q: What is the likely impact of successful exploitation?

An attacker may upload executable files, which can enable remote code execution. This can lead to compromise of the affected WordPress site with high confidentiality, integrity, and availability impact.

Published Oct 31, 2026

Updated

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 handleupload 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 handleupload. 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.

Event History

Oct 31, 2026

CVE Published

via MITRE·08:30 AM

Data Sourced

via MITRE·08:30 AM

DescriptionSeverityWeakness

Data Sourced

via NVD·09:16 AM

DescriptionSeverityWeakness

Frequently Asked Questions

Who is exposed to exploitation?

WordPress sites running SimpleForm version 3.10.2 or earlier are exposed if they have a publicly accessible page that embeds a SimpleForm shortcode. An unauthenticated visitor can obtain the required nonce from that form's data-nonce attribute.

What does an attacker need to exploit this issue?

No account, privileges, or user interaction are required. The attacker needs access to a public page containing the form and can use a trailing-dot filename and an unrecognized file key to bypass the upload validation.

What is the likely impact of successful exploitation?

An attacker may upload executable files, which can enable remote code execution. This can lead to compromise of the affected WordPress site with high confidentiality, integrity, and availability impact.

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

Event History

Frequently Asked Questions

Who is exposed to exploitation?

What does an attacker need to exploit this issue?

What is the likely impact of successful exploitation?

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Frequently Asked Questions

Who is exposed to exploitation?

What does an attacker need to exploit this issue?

What is the likely impact of successful exploitation?