CVE-2025-68982

Executive Summary

CVE-2025-68982 is a Missing Authorization vulnerability in the DesignThemes LMS Addon WordPress plugin, affecting versions up to and including 2.6. This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to sensitive data or functionality. The vulnerability has a CVSS score of 5.3 (Medium), with no known public proof-of-concept or exploit code at this time. The vendor has not released a patch, and the status remains UNKNOWN.

WordPress Ecosystem Context

This vulnerability is specific to the WordPress plugin ecosystem, specifically the designthemes-lms-addon plugin. It is not related to Apache or Nginx server configurations. The missing authorization check likely occurs in REST API endpoints or AJAX actions that fail to verify user capabilities before processing requests.

CVSS Breakdown & Threat Level

• CVSS Score: 5.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – Impact confined to the vulnerable component.
• Confidentiality Impact: Low (C:L) – Limited information disclosure.
• Integrity Impact: None (I:N) – No data modification.
• Availability Impact: None (A:N) – No service disruption.

Threat Level: Medium. While the impact is limited to confidentiality, the lack of authentication requirement and low attack complexity make it a viable target for automated scanning and exploitation.

Deep Dive & Mechanics

The vulnerability stems from a Missing Authorization check in the designthemes-lms-addon plugin. In WordPress plugins, authorization is typically enforced via current_user_can() or wp_verify_nonce() checks. This plugin fails to validate user capabilities before executing sensitive operations, such as:

• Accessing course materials or student data via REST API endpoints.
• Modifying plugin settings or user roles.
• Triggering administrative functions without proper capability checks.

The affected code likely resides in AJAX handlers or REST API routes registered by the plugin. For example, a function like lms_get_student_data() might be hooked to wp_ajax_nopriv_* (allowing unauthenticated access) without verifying the user's role.

Root Cause: The plugin uses add_action('wp_ajax_nopriv_...', ...) or register_rest_route() with permission_callback set to __return_true or omitted entirely.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical comparison based on common WordPress authorization patterns.

Vulnerable Code (<= 2.6):

add_action('wp_ajax_nopriv_lms_get_courses', 'lms_get_courses_handler');
function lms_get_courses_handler() {
    // No capability check
    $courses = get_posts(['post_type' => 'lms_course']);
    wp_send_json($courses);
}

Patched Code (Hypothetical):

add_action('wp_ajax_lms_get_courses', 'lms_get_courses_handler');
add_action('wp_ajax_nopriv_lms_get_courses', 'lms_get_courses_handler');
function lms_get_courses_handler() {
    if (!current_user_can('read')) {
        wp_die('Unauthorized', 403);
    }
    $courses = get_posts(['post_type' => 'lms_course']);
    wp_send_json($courses);
}

The patched version adds a current_user_can('read') check and removes the nopriv hook for sensitive actions, or adds proper permission callbacks in REST API routes.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with designthemes-lms-addon <= 2.6 installed and activated.
• No authentication required.

Exploitation Steps:

1. Identify vulnerable endpoints by analyzing plugin source or using fuzzing tools.
2. Send a direct HTTP request to a sensitive AJAX action or REST endpoint.

Example Request:

curl -X GET "http://target.com/wp-admin/admin-ajax.php?action=lms_get_student_data&user_id=1"

Expected Response:

{
  "user_id": 1,
  "email": "admin@example.com",
  "courses": ["Course A", "Course B"]
}

Automation with Nuclei (if template were available):

id: CVE-2025-68982
info:
  name: DesignThemes LMS Addon Missing Authorization
  severity: medium
  description: Missing authorization in designthemes-lms-addon plugin
requests:
  - method: GET
    path:
      - "{{BaseURL}}/wp-admin/admin-ajax.php?action=lms_get_student_data&user_id=1"
    matchers:
      - type: word
        words:
          - "user_id"
          - "email"

Blue Team (Detection & Defense)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with action parameters related to LMS functionality.
• Look for requests from unauthenticated users to endpoints that should require authentication.

Defense:

• Implement a Web Application Firewall (WAF) rule to block requests to sensitive AJAX actions without proper nonce or authentication.
• Disable the plugin until a patch is available.
• Use WordPress security plugins to enforce capability checks.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests to /wp-admin/admin-ajax.php with action=lms_* parameters from unauthenticated sources.
  • Unusual JSON responses containing sensitive data like user emails or course details.

• File IOCs:

  • Presence of designthemes-lms-addon plugin directory with version <= 2.6.
  • Modified plugin files (if attacker uploads malicious code).

• Log IOCs:

  • WordPress debug logs showing wp_ajax_nopriv_* calls without corresponding capability checks.

Detection Engineering

YARA Rule

rule CVE_2025_68982_DesignThemes_LMS_Missing_Auth {
    meta:
        description = "Detects vulnerable designthemes-lms-addon plugin files"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-68982"
    strings:
        $vuln_func = "wp_ajax_nopriv_" nocase
        $lms_prefix = "lms_" nocase
        $no_cap_check = "current_user_can" nocase
    condition:
        $vuln_func and $lms_prefix and not $no_cap_check
}

Sigma Rule

title: CVE-2025-68982 - DesignThemes LMS Addon Missing Authorization
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects unauthenticated access to LMS AJAX endpoints
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        c-uri|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=lms_'
    condition: selection
falsepositives:
    - Legitimate AJAX calls from authenticated users (requires correlation with session)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-68982 - DesignThemes LMS Addon Missing Authorization"; flow:to_server; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=lms_"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released by the vendor.
2. Implement a WAF rule to block unauthenticated requests to admin-ajax.php with action=lms_* parameters.
3. Monitor logs for exploitation attempts.

Long-term Fix:

• The vendor must release a patched version that adds proper capability checks (e.g., current_user_can('manage_options')) to all AJAX and REST endpoints.
• Users should update to the latest version once available.

Workaround:

• Add custom code to the theme's functions.php to enforce authorization:

add_action('init', function() {
    if (defined('DOING_AJAX') && DOING_AJAX) {
        $action = $_REQUEST['action'] ?? '';
        if (strpos($action, 'lms_') === 0 && !current_user_can('read')) {
            wp_die('Unauthorized', 403);
        }
    }
});

Valters IT
Securing Digital Ecosystems