Exploitation Research Plan: CVE-2026-22489 (Image Slider Slideshow)

1. Vulnerability Summary

The Image Slider Slideshow plugin for WordPress (versions <= 1.8) is vulnerable to an Insecure Direct Object Reference (IDOR). The vulnerability exists because the plugin registers AJAX handlers that perform sensitive operations (likely slider deletion or modification) based on a user-supplied ID parameter without verifying if the requesting user has the necessary permissions (e.g., manage_options) or ownership of the object. This allows an authenticated user with at least Contributor level access to modify or delete sliders created by administrators.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php
• Action: iss_delete_slider (inferred based on common IDOR patterns in this plugin)
• Vulnerable Parameter: id or slider_id
• Authentication: Authenticated, Contributor role or higher.
• Preconditions: At least one slider must exist in the system (created by an admin).

3. Code Flow

1. Entry Point: A Contributor user sends a POST request to admin-ajax.php with action=iss_delete_slider.
2. Hook Registration: The plugin registers the action using:
   add_action('wp_ajax_iss_delete_slider', 'iss_delete_slider_callback');
3. Vulnerable Function: The iss_delete_slider_callback function is invoked.
4. Missing Check: The function likely performs a nonce check (which a Contributor can pass if the nonce is exposed) but fails to call current_user_can('manage_options').
5. Sink: The function retrieves the id from $_POST['id'] and passes it to a database query like:
   $wpdb->delete($table_name, array('id' => $id));

4. Nonce Acquisition Strategy

The plugin likely localizes a nonce for its AJAX operations. Based on the plugin structure, the nonce is likely registered in an admin-side script.

1. Identify Script Localization: Search the source for wp_localize_script. It is likely localized under a variable name like iss_ajax_obj or iss_vars.
2. Determine Access: Since the vulnerability requires Contributor access, check if the "Image Slider" menu is visible to Contributors. If not, the script might still be enqueued on all admin pages or via a shortcode.
3. Execution Plan:
   • Log in as a Contributor.
   • Navigate to the WordPress Dashboard (/wp-admin/).
   • Use browser_eval to extract the nonce:
     browser_eval("window.iss_ajax_obj?.nonce || window.iss_vars?.nonce") (inferred keys).
   • If the nonce is not in the admin dashboard, create a page with the slider shortcode:
     wp post create --post_type=page --post_status=publish --post_content='[image-slider-slideshow]'
   • Navigate to that page and extract the nonce using the same browser_eval method.

5. Exploitation Strategy

The goal is to delete a slider created by an administrator.

1. Step 1: Discover Target ID: List existing sliders using WP-CLI to identify a target ID.
2. Step 2: Authenticate: Log in as a Contributor user.
3. Step 3: Extract Nonce: Use the browser_eval method described in Section 4 to obtain a valid _wpnonce.
4. Step 4: Execute Deletion: Send a POST request to admin-ajax.php using the http_request tool.

Example Request:

• URL: http://localhost:8080/wp-admin/admin-ajax.php
• Method: POST
• Headers: Content-Type: application/x-www-form-urlencoded
• Body:

  action=iss_delete_slider&id=[TARGET_SLIDER_ID]&_wpnonce=[EXTRACTED_NONCE]
  

  (Note: Parameter names like id or slider_id should be verified against the source code or by intercepting a legitimate admin request.)

6. Test Data Setup

1. Admin User: Create a slider using the plugin's dashboard (as Administrator).
   • wp eval "/* Code to programmatically create an ISS slider or use the UI via browser */"
2. Identify ID: Get the ID of the newly created slider.
3. Contributor User: Create a user with the contributor role.
   • wp user create attacker attacker@example.com --role=contributor --user_pass=password

7. Expected Results

• HTTP Response: A successful request should return a 200 OK or a JSON success message (e.g., {"success":true}).
• System State: The slider with the specified ID should be removed from the database.

8. Verification Steps

1. Database Check: Use WP-CLI to verify the slider is gone:
   wp db query "SELECT * FROM wp_posts WHERE post_type='iss_slider' AND ID=[TARGET_SLIDER_ID]"
   (Note: Check if sliders use a custom table or CPT iss_slider / slider.)
2. UI Check: Navigate to the Image Slider Slideshow dashboard as an admin and verify the slider is no longer listed.

9. Alternative Approaches

If iss_delete_slider is not the vulnerable action:

• Check for iss_save_slider: Attempt to modify the settings of an admin's slider by changing its title or slides.
• Check for iss_get_slider: Attempt to retrieve private slider configuration data (Inferred IDOR for Information Disclosure).
• Check for Missing Nonce: Some versions may omit the check_ajax_referer call entirely, making the exploit possible without a nonce. Try the request without the _wpnonce parameter first.