WordPress File Upload Form Risk Checklist

Symptoms

• A form accepts resumes, documents, images, PDFs, or other attachments from public visitors.
• Upload files are stored under public paths, emailed insecurely, or available to too many administrators.
• Spam submissions include suspicious files, oversized attachments, or unexpected extensions.

Most Common Causes

• Upload forms increase risk because visitors can send files the site must store, scan, email, or expose to staff.
• Allowed extension checks, MIME validation, size limits, storage location, and public URL access can all drift.
• Emailing attachments can create deliverability and privacy problems when files are large or sensitive.

How To Confirm The Cause

• List allowed extensions, MIME checks, file-size limits, storage path, public access, retention, notification behavior, and who can download files.
• Test legitimate files and blocked risky files in a controlled environment.
• Review whether uploaded files contain private data and whether privacy copy explains collection and retention.

Fixes

• Allow only required file types and keep size limits as low as the workflow permits.
• Store uploads in protected paths where possible and avoid public indexing or executable handling.
• Moderate or scan uploads according to risk, and avoid emailing sensitive attachments broadly.

How To Verify The Fix

• Confirm accepted files arrive only for approved types and rejected files fail safely.
• Check that uploaded files are not publicly browsable or executable.
• Review retention and access after form or plugin changes.

When To Contact Support

Escalate when forms collect sensitive documents, medical/legal/financial data, executable files, or files needing malware scanning and privacy review.