This exploitation research plan targets CVE-2026-48865, a reflected Cross-Site Scripting (XSS) vulnerability in the LearnPress plugin for WordPress.

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Exploitation Research Plan: CVE-2026-48865 (LearnPress Reflected XSS)

1. Vulnerability Summary

The LearnPress plugin (<= 4.3.6) fails to adequately sanitize and escape user-supplied input before reflecting it on the page. Specifically, parameters used in course searching, filtering, or pagination on the course archive page are echoed back into the HTML document. This allows an unauthenticated attacker to execute arbitrary JavaScript in the context of the victim's browser session.

2. Attack Vector Analysis

• Vulnerable Endpoint: Course Archive Page (typically /courses/ or ?post_type=lp_course).
• Vulnerable Parameter: lp-s (Search parameter) or orderby (Sorting parameter).
• Authentication: Unauthenticated (None).
• Preconditions: The plugin must be active. For the payload to be most effective, a course archive page should exist.

3. Code Flow (Inferred)

1. Entry Point: A user navigates to a URL containing the lp-s parameter (e.g., example.com/courses/?lp-s=payload).
2. Processing: The plugin's core logic (likely in inc/lp-template-functions.php or inc/class-lp-query.php) retrieves the search string from $_GET['lp-s'].
3. Reflection: The search term is passed to the archive template (e.g., templates/archive-course.php) to display a "Search results for: [term]" message.
4. Sink: The value is echoed directly or via a wrapper like learn_press_get_template() without passing through esc_html() or esc_attr(). Based on the provided CSS, the output likely resides within a .learn-press-message or search box container.

4. Nonce Acquisition Strategy

Reflected XSS in a standard GET request typically does not require a nonce, as the vulnerability exists in the initial page render. However, if the reflection occurs via the LearnPress AJAX search (identified by lp-tom-select in the CSS), a nonce might be required.

Strategy for AJAX Nonce (if needed):

1. Identify Trigger: The AJAX search is often triggered on pages containing the [learn_press_recent_courses] shortcode or the default course archive.
2. Setup: Create a page with the shortcode:

   wp post create --post_type=page --post_title="Courses" --post_status=publish --post_content='[learn_press_recent_courses]'
   

3. Extraction: Navigate to the page and extract the nonce from the lpGlobalSettings object:
   • JS Variable: window.lpGlobalSettings
   • Nonce Key: nonce
   • Command: browser_eval("window.lpGlobalSettings?.nonce")

5. Exploitation Strategy

We will test reflection in the search parameter on the main course archive.

• Endpoint: / (WordPress Root)
• Method: GET
• Payload: "><script>alert(document.domain)</script>
• Target URL: http://localhost:8080/?post_type=lp_course&lp-s=%22%3E%3Cscript%3Ealert(document.domain)%3C/script%3E

Step-by-Step Plan:

1. Discovery: Find the course archive URL.
2. Request: Use http_request to send the payload.
3. Analysis: Check the response body for the unescaped script tag.
4. DOM Verification: Use browser_navigate to confirm the script executes (triggering a dialog or modifying a DOM property).

6. Test Data Setup

1. Install Plugin: Ensure LearnPress 4.3.6 is installed.
2. Create Content: Create at least one course to ensure the archive page renders correctly.

   wp post create --post_type=lp_course --post_title="Security Testing 101" --post_status=publish
   

3. Permalinks: Flush rewrite rules to ensure the /courses/ slug works if configured.

   wp rewrite structure '/%postname%/' --hard
   wp rewrite flush --hard
   

7. Expected Results

• The HTTP response should contain the literal string: value=""><script>alert(document.domain)</script>" or Results for: "><script>....
• If testing via a browser, the alert dialog should appear.
• The script should not be neutralized as <script>.

8. Verification Steps

After the exploit attempt, verify the reflection point in the page source:

# Using http_request and searching for the canary
# If the payload is <script>alert(1337)</script>
grep "alert(1337)" response_body.txt

9. Alternative Approaches

If lp-s is sanitized, try these alternative parameters:

• orderby: ?post_type=lp_course&orderby=price"><script>alert(1)</script>
• paged: ?post_type=lp_course&paged=1<script>alert(1)</script>
• AJAX Reflection: Use http_request to call admin-ajax.php with action=lp_course_search and the payload in the term or s parameter, checking for unescaped JSON output.