CVE-2026-15748
Received Received - Intake

Arbitrary File Upload in Forminator WordPress Plugin

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Wordfence

Description
The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-extension blocklist performs exact-key matching that is bypassed by pipe-alternative MIME type keys, combined with a public submission handler that trusts attacker-controlled upload field configuration injected via a forged Select field value. 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
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-18
AI Q&A
2026-08-18
EPSS Evaluated
N/A
NVD
CVE-2026-15748
EUVD
EUVD-2026-60569

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpforms forminator_forms to 1.56.1 (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 Forminator Forms WordPress plugin has an arbitrary file upload vulnerability in versions up to 1.56.1. The flaw is in the handle_file_upload function where file type validation is insufficient. Attackers can bypass the dangerous-extension blocklist by using pipe-alternative MIME types. An unauthenticated attacker can exploit this by injecting a forged Select field value to configure upload fields, allowing them to upload executable files and achieve remote code execution.

Detection Guidance

Check for unauthorized file uploads in WordPress directories, especially in uploads folders. Look for unexpected PHP or executable files. Review server logs for POST requests to /wp-admin/admin-ajax.php with file upload parameters.

Impact Analysis

This vulnerability allows unauthenticated attackers to upload malicious files to your WordPress site. If exploited, attackers could execute arbitrary code on your server, potentially taking full control of your website, stealing data, or using your server for further attacks. It poses a high risk to site integrity and confidentiality.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and security. Organizations may face legal penalties, fines, and reputational damage if exploited. Compliance with these regulations requires timely patching and security measures to prevent such vulnerabilities.

Mitigation Strategies

Update the Forminator Forms plugin to the latest version immediately. Disable file uploads if not required. Implement strict file type validation and disable MIME type bypasses. Monitor for suspicious file uploads and unauthorized access.

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