CVE-2025-66083

Executive Summary

CVE-2025-66083 is a Missing Authorization vulnerability in the WpEvently (mage-eventpress) WordPress plugin by Magepeopleteam, affecting versions up to and including 5.0.4. This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized data exposure or privilege escalation. The vulnerability has a CVSS score of 5.3 (Medium) and an EPSS score of 0.0%, indicating low exploitation likelihood at this time. No public proof-of-concept or patch details are currently available.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository and potentially through third-party marketplaces. Organizations using WpEvently should verify the integrity of their plugin files and monitor for updates. Since no patch is available, immediate mitigation through access controls or plugin disabling is recommended.

CVSS Breakdown & Threat Level

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

Threat Level: Medium. While the CVSS score is moderate, the lack of authentication requirements and the potential for data exposure in event management contexts (e.g., attendee lists, private event details) elevate the risk for organizations handling sensitive event data.

Deep Dive & Mechanics

The vulnerability resides in the mage-eventpress plugin’s AJAX handlers or REST API endpoints that fail to enforce proper capability checks. In WordPress, functions like wp_ajax_* and wp_ajax_nopriv_* hooks must verify user permissions using current_user_can() or similar checks. This plugin likely exposes actions that should require administrative or editor-level privileges but are accessible to unauthenticated users.

Root Cause: The plugin’s access control logic uses incorrect or missing capability checks, allowing any remote user to trigger sensitive operations such as:

• Retrieving event attendee data
• Modifying event settings
• Accessing private event details

Attack Vector: An attacker sends crafted HTTP requests to the vulnerable endpoints without authentication. For example:

POST /wp-admin/admin-ajax.php HTTP/1.1
Host: target-site.com
Content-Type: application/x-www-form-urlencoded

action=mage_eventpress_export_attendees&event_id=123

Vulnerable vs. Patched Code

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

Vulnerable Code (<= 5.0.4):

add_action('wp_ajax_nopriv_mage_export_attendees', 'mage_export_attendees');
function mage_export_attendees() {
    // No capability check
    $event_id = $_POST['event_id'];
    // Export logic...
}

Patched Code (Hypothetical):

add_action('wp_ajax_mage_export_attendees', 'mage_export_attendees');
add_action('wp_ajax_nopriv_mage_export_attendees', function() {
    wp_die('Unauthorized', 403);
});
function mage_export_attendees() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    $event_id = sanitize_text_field($_POST['event_id']);
    // Export logic...
}

Exploitation & Lab Setup

Red Team

1. Reconnaissance: Identify WordPress sites using WpEvently via Shodan dorks or Google dorking (inurl:/wp-content/plugins/mage-eventpress).
2. Endpoint Discovery: Enumerate AJAX actions by analyzing the plugin’s JavaScript files (e.g., mage-eventpress.js) for action parameters.
3. Exploitation: Send unauthenticated POST requests to admin-ajax.php with discovered actions. Example:

   curl -X POST https://target.com/wp-admin/admin-ajax.php \
     -d "action=mage_eventpress_get_private_events"
   

4. Data Exfiltration: If successful, extract event data, attendee lists, or configuration details.

Blue Team

1. Detection: Monitor for unusual AJAX requests from unauthenticated users, especially to admin-ajax.php with plugin-specific actions.
2. Honeypot: Deploy a decoy WordPress instance with the vulnerable plugin to capture attacker behavior.
3. Mitigation: Temporarily disable the plugin or implement a Web Application Firewall (WAF) rule to block unauthenticated requests to known vulnerable endpoints.
4. Forensics: Check access logs for patterns like action=mage_eventpress_* from IPs without prior authentication.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP POST requests to /wp-admin/admin-ajax.php with action parameters containing mage_eventpress_ or mage_ prefixes.
  • Repeated requests from the same IP to multiple AJAX actions without a valid session cookie.
• File IOCs:
  • Modified or suspicious files in /wp-content/plugins/mage-eventpress/ (e.g., unexpected PHP files).
  • New user accounts with elevated privileges (if exploitation leads to privilege escalation).
• Log IOCs:
  • WordPress debug log entries showing wp_die or 403 responses for AJAX actions.
  • Web server logs with admin-ajax.php requests from IPs not associated with authenticated sessions.

Detection Engineering

YARA Rule

rule CVE_2025_66083_WpEvently_Missing_Auth {
    meta:
        description = "Detects exploitation attempts for CVE-2025-66083 in WpEvently plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-66083"
    strings:
        $ajax_action = /action=mage_eventpress_[a-z_]+/
        $admin_ajax = "admin-ajax.php"
        $nopriv = "wp_ajax_nopriv_"
    condition:
        $admin_ajax and $ajax_action and #nopriv > 0
}

Sigma Rule

title: CVE-2025-66083 WpEvently Missing Authorization Exploitation
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects unauthenticated AJAX requests targeting WpEvently plugin endpoints
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|contains: 'action=mage_eventpress_'
    condition: selection
falsepositives:
    - Legitimate plugin functionality if accessed by authenticated users (check for session cookie)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-66083 WpEvently Missing Authorization Attempt"; flow:to_server,established; content:"POST"; http_method; content:"admin-ajax.php"; http_uri; content:"action=mage_eventpress_"; http_client_body; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Disable the WpEvently plugin until a patch is released.
2. Workaround: Implement a WAF rule to block unauthenticated requests to admin-ajax.php with action parameters starting with mage_eventpress_.
3. Monitoring: Enable detailed logging for AJAX requests and review for suspicious activity.
4. Patch: Apply the official patch from Magepeopleteam as soon as it becomes available. Monitor the plugin’s changelog or GitHub repository.
5. Hardening: Ensure WordPress installation follows least privilege principles and uses strong authentication mechanisms.

Valters IT
DevSecOps & Cyber Threat Intelligence Division
Report generated for CVE-2025-66083