CVE-2026-10818
Received Received - Intake

Arbitrary File Upload in WPForms Pro WordPress Plugin

Publication date: 2026-07-25

Last updated on: 2026-07-25

Assigner: Wordfence

Description
The WPForms Pro plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.10.1.1 via the ajax_chunk_upload_finalize function. This is due to the file type validation occurring after chunk metadata and file contents have already been written to disk, and the assembled file not being deleted upon validation failure. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

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Meta Information

Published
2026-07-25
Last Modified
2026-07-25
Generated
2026-07-25
AI Q&A
2026-07-25
EPSS Evaluated
N/A
NVD
CVE-2026-10818
EUVD
EUVD-2026-48766

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpforms wpforms_pro to 1.10.1.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-434 The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

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Executive Summary

The WPForms Pro plugin for WordPress has a vulnerability in versions up to 1.10.1.1 that allows arbitrary file uploads. The issue occurs in the ajax_chunk_upload_finalize function where file type validation happens after the file is already written to disk. If validation fails, the file is not deleted, allowing attackers to upload potentially executable files and execute remote code without authentication.

Detection Guidance

Check for unauthorized file uploads in WordPress directories, especially in uploads folders. Look for unexpected PHP or executable files. Use commands like 'find /path/to/wordpress -type f -name "*.php" -newer /path/to/wordpress/wp-config.php' to detect recently added PHP files.

Impact Analysis

This vulnerability allows unauthenticated attackers to upload malicious files to your WordPress site. These files could be executable, enabling attackers to take control of your website, steal data, or use it for further attacks. It poses a significant risk to site integrity and user data.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and security. Organizations using affected WPForms versions may face compliance violations, legal penalties, and reputational damage due to compromised user data.

Mitigation Strategies

Update WPForms Pro to the latest version beyond 1.10.1.1. If immediate update is not possible, disable file uploads in WPForms settings or restrict upload permissions. Review server logs for suspicious upload activity and remove any unauthorized files.

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