Research Plan: CVE-2025-68876 - Invelity SPS connect Reflected XSS

1. Vulnerability Summary

The Invelity SPS connect plugin (<= 1.0.8) is vulnerable to Reflected Cross-Site Scripting (XSS). The vulnerability exists because the plugin accepts user-supplied input through web requests (likely via $_GET, $_POST, or $_REQUEST) and echoes this input back into the HTML response without sufficient sanitization (e.g., sanitize_text_field) or context-aware output escaping (e.g., esc_html, esc_attr). An unauthenticated attacker can craft a malicious URL containing a JavaScript payload that executes in the context of the victim's browser when visited.

2. Attack Vector Analysis

• Endpoint: Likely a frontend page where a plugin shortcode is present, or a plugin-specific admin page.
• Vulnerable Parameter: Likely a status message, error parameter, or search query (e.g., message, error, sps_status, or tab).
• Authentication: Unauthenticated (for frontend reflection) or requiring an Admin/Editor victim to click a link (for admin-side reflection).
• Preconditions: The plugin must be active. If the reflection occurs via a shortcode, a page containing that shortcode must exist.

3. Code Flow (Inferred)

Since source files are not provided, the following trace is based on standard WordPress Reflected XSS patterns in similar plugins:

1. Entry Point: A user accesses a URL with a specific query parameter (e.g., ?sps_error=<script>alert(1)</script>).
2. Hook: The plugin likely hooks into init, wp_enqueue_scripts, or a shortcode callback (e.g., add_shortcode('sps_connect', ...)) to process the request.
3. Processing: The plugin retrieves the parameter: $error_msg = $_GET['sps_error']; (or similar).
4. Sink: The plugin echoes the variable directly into the HTML: echo '<div class="error">' . $error_msg . '</div>'; without calling esc_html().

Agent Task: Use the following command to find the exact sink:

grep -rP "echo\s+\\\$(_GET|_POST|_REQUEST)" /var/www/html/wp-content/plugins/invelity-sps-connect/

4. Nonce Acquisition Strategy

Reflected XSS typically does not require a nonce because it exploits the rendering of a request parameter rather than a state-changing action. However, if the reflection happens within an AJAX handler registered via wp_ajax_nopriv_, a nonce might be required.

If a nonce is required:

1. Identify Shortcode: Find shortcodes in the plugin: grep -r "add_shortcode" .
2. Create Page: wp post create --post_type=page --post_status=publish --post_title="SPS Test" --post_content='[SHORTCODE_NAME]'
3. Find JS Variable: Search for wp_localize_script in the source to find the object name: grep -r "wp_localize_script" .
4. Extract via Browser:
   • Navigate to the created page.
   • browser_eval("window.LOCALIZATION_OBJECT?.nonce_key") (e.g., window.sps_connect_vars?.nonce).

5. Exploitation Strategy

The goal is to demonstrate reflected XSS by injecting a script that executes in the browser.

• Step 1: Discover Vulnerable Parameter
  Test common parameters found via grep:
  • http://localhost:8080/?sps_error=CANARY<script>alert(1)</script>
  • http://localhost:8080/?message=CANARY<script>alert(1)</script>
• Step 2: Construct Payload
  Use a simple alert to prove execution: <script>alert(document.domain)</script>.
  If the reflection is inside an attribute (e.g., value="..."), use: "><script>alert(1)</script>.
• Step 3: Execution
  Use the http_request tool to simulate the victim visiting the link and check if the payload is reflected unescaped in the response body.

Target HTTP Request (Example):

GET /?sps_error=%3Cscript%3Ealert(1)%3C/script%3E HTTP/1.1
Host: localhost:8080
User-Agent: Mozilla/5.0

6. Test Data Setup

1. Install/Activate Plugin: Ensure invelity-sps-connect is installed and active.
2. Identify Frontend Entry Point: Search for shortcodes used by the plugin.

   grep -rn "add_shortcode" /var/www/html/wp-content/plugins/invelity-sps-connect/
   

3. Place Shortcode: Create a page using the found shortcode to ensure all plugin logic is loaded.

   wp post create --post_type=page --post_status=publish --post_content='[invelity_sps_connect]' --post_title='SPS'
   

7. Expected Results

• The HTTP response should contain the literal string <script>alert(1)</script> or its attribute-breaking equivalent.
• The response Content-Type must be text/html.
• If viewed in a browser, an alert box should appear.

8. Verification Steps

1. Manual Source Check: After finding the vulnerable parameter, confirm the PHP code responsible:

   # Example: if the parameter is 'msg'
   grep -rn "msg" /var/www/html/wp-content/plugins/invelity-sps-connect/ | grep "echo"
   

2. Validate Lack of Escaping: Confirm the code does not use esc_html(), esc_attr(), or wp_kses() on the reflected variable.

9. Alternative Approaches

• Admin-Side Reflection: If no frontend reflection is found, check admin menu pages (add_menu_page). Use browser_navigate as an administrator to wp-admin/admin.php?page=invelity-sps-connect&error=<script>alert(1)</script>.
• Attribute Injection: If <script> is blocked or filtered, try onmouseover:
  ?param=" onmouseover="alert(1)" style="display:block;width:100%;height:100%;position:fixed;top:0;left:0;
• Template Directives: Check if the plugin includes any custom templates that might use $_SERVER['REQUEST_URI'] or $_SERVER['PHP_SELF'] unsafely.