CVE-2025-66082

Executive Summary

CVE-2025-66082 is a Missing Authorization vulnerability in the WpEvently (formerly mage-eventpress) WordPress plugin by Magepeopleteam. 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 affects all versions up to and including 5.0.4. As of this report, no official patch has been released, and no public proof-of-concept (PoC) or exploit code is available. The EPSS score is 0.0%, indicating low exploitation activity in the wild, but the risk remains due to the lack of a patch.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. Users who have installed the plugin from the repository or via direct download are affected. The plugin is not available on NPM, PyPI, Go, or Ruby ecosystems.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Base Score: 5.3 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: Low (C:L)
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)

Threat Level: Medium. The vulnerability is easy to exploit remotely without authentication, but the impact is limited to low confidentiality loss. However, the lack of a patch increases the risk for unmitigated installations.

Deep Dive & Mechanics

The vulnerability stems from a Missing Authorization check in the WpEvently plugin. The plugin likely exposes REST API endpoints or AJAX actions that fail to verify user permissions before executing sensitive operations. An attacker can send crafted HTTP requests to these endpoints to access or modify data that should be restricted to authenticated users with specific roles.

Root Cause: The plugin does not implement proper capability checks (e.g., current_user_can()) in functions handling user input or API requests. This allows unauthenticated attackers to trigger actions intended for administrators or event managers.

Attack Vector: The attacker sends a specially crafted HTTP request (e.g., POST or GET) to a vulnerable endpoint. Since no authentication is required, the request is processed, potentially exposing event data, settings, or other sensitive information.

Impact: Successful exploitation could lead to:

• Unauthorized viewing of event details, attendee lists, or plugin settings.
• Modification of non-critical plugin options (if integrity is partially affected).
• Information disclosure that aids further attacks.

Vulnerable vs. Patched Code

Since no patch is available, we can only analyze the vulnerable code pattern. The following is a hypothetical example based on common WordPress plugin vulnerabilities.

Vulnerable Code (e.g., in mage-eventpress.php):

add_action('wp_ajax_nopriv_get_event_data', 'get_event_data');
function get_event_data() {
    $event_id = $_POST['event_id'];
    // No authorization check
    $event = get_post($event_id);
    echo json_encode($event);
    wp_die();
}

Patched Code (hypothetical):

add_action('wp_ajax_get_event_data', 'get_event_data');
add_action('wp_ajax_nopriv_get_event_data', 'get_event_data');
function get_event_data() {
    if (!current_user_can('edit_posts')) {
        wp_die('Unauthorized', 403);
    }
    $event_id = intval($_POST['event_id']);
    $event = get_post($event_id);
    echo json_encode($event);
    wp_die();
}

The patched version adds a capability check (current_user_can('edit_posts')) and sanitizes the input (intval()). Without the patch, any unauthenticated user can call the endpoint.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A WordPress installation with WpEvently <= 5.0.4 active.
• Network access to the target.

Exploitation Steps:

1. Identify vulnerable endpoints by analyzing the plugin's source code or using a tool like Burp Suite to spider the site.
2. Send a crafted request to a vulnerable AJAX action or REST route. For example:

   curl -X POST http://target.com/wp-admin/admin-ajax.php \
        -d 'action=get_event_data&event_id=1'
   

3. Observe the response. If the endpoint returns data without authentication, the vulnerability is confirmed.

Note: No public exploit code is available. The above is a generic example.

Blue Team (Defensive)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with actions that do not require authentication.
• Look for requests with parameters like action=get_event_data or similar from unauthenticated sources.

Mitigation:

• Disable the plugin until a patch is released.
• Use a Web Application Firewall (WAF) to block requests to known vulnerable endpoints.
• Implement virtual patching via a security plugin (e.g., Wordfence) to add capability checks.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /wp-admin/admin-ajax.php with action parameters related to WpEvently (e.g., get_event_data, save_settings).
  • Unauthenticated POST requests to /wp-json/wpevently/v1/ endpoints.
• File IOCs:
  • Presence of the plugin directory: /wp-content/plugins/mage-eventpress/ or /wp-content/plugins/wpevently/.
  • Modified plugin files (if attacker uploads malicious code).
• Log IOCs:
  • WordPress debug logs showing PHP notices or warnings from the plugin.
  • Access logs with repeated requests to AJAX endpoints from the same IP.

Detection Engineering

YARA Rule

rule Detect_WpEvently_Missing_Auth {
    meta:
        description = "Detects WpEvently plugin files with missing authorization checks"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-66082"
    strings:
        $func1 = "wp_ajax_nopriv_" ascii wide nocase
        $func2 = "current_user_can" ascii wide nocase
        $plugin_header = "Plugin Name: WpEvently" ascii wide nocase
    condition:
        $plugin_header and $func1 and not $func2
}

Sigma Rule

title: Unauthenticated AJAX Request to WpEvently Endpoint
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated requests to WpEvently AJAX actions
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        c-uri|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action='
    condition: selection
falsepositives:
    - Legitimate plugin functionality if misconfigured
level: medium

Suricata Rule

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"CVE-2025-66082 - WpEvently Missing Authorization Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action="; http_client_body;
    pcre:"/action=(get_event_data|save_settings|wpevently_)/i";
    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 Web Application Firewall (WAF) rule to block requests to known vulnerable endpoints.
3. Monitor logs for suspicious activity targeting the plugin.

Long-term Fix:

• Apply the official patch once released by Magepeopleteam.
• Consider replacing the plugin with an alternative that is actively maintained and has a security track record.

Virtual Patching (via Wordfence or similar):

• Add a firewall rule to require authentication for all AJAX actions from the plugin.
• Example Wordfence rule:

  if (preg_match('/action=(get_event_data|save_settings)/', $_POST['action'])) {
      if (!is_user_logged_in()) {
          block_request();
      }
  }
  

Valters IT
Securing Digital Frontiers