CVE-2026-118235 Details
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.
A vulnerability allowing arbitrary file upload has been identified in the SimpleForm WordPress plugin, specifically in versions through 3.10.2. The issue arises in the handle_upload function, where a lack of server-side file key allowlisting and improper extension validation allows filenames with trailing dots to bypass all extension and MIME type checks. This flaw enables unauthenticated attackers to upload potentially executable files, leading to remote code execution. The only access control in place is a nonce, which is easily accessible to any unauthenticated user on a page with the form shortcode.
Users are advised to update the SimpleForm WordPress plugin to version 3.11.0 or later.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 31, 2026CISA-ADP
Assessed Nov 2, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-434 | Unrestricted Upload of File with Dangerous Type | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| SimpleForm | <= 3.10.2 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Oct 31, 2026 | New CVE Received | [email protected] |