CVE-2025-7663

Executive Summary

CVE-2025-7663 is a critical missing authorization vulnerability in the Ovatheme Events Manager plugin for WordPress, affecting all versions up to and including 1.8.6. The flaw resides in the /class-ovaem-ajax.php file, where several AJAX handler functions lack proper capability checks. This allows unauthenticated attackers to perform privileged actions such as deleting ticket files, downloading tickets, and other administrative operations. The vulnerability is classified as a Missing Authorization (CWE-862) issue, with a CVSS score of 6.5 (Medium). Given that this is a WordPress plugin, the attack surface is broad, as any WordPress site running the vulnerable plugin is exposed. No public exploit code or proof-of-concept has been released, but the risk is elevated due to the ease of exploitation (no authentication required) and the potential for data loss and information disclosure.

Supply Chain & Package Security

This vulnerability is specific to the Ovatheme Events Manager WordPress plugin. It is not a package manager (NPM, PyPI, Go, Ruby) issue, but rather a WordPress ecosystem supply chain risk. Users who have installed this plugin from the WordPress plugin repository or directly from Ovatheme are affected. The lack of a patch from the vendor means that the supply chain is currently broken, and users must rely on alternative mitigations.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
• Base Score: 6.5 (Medium)
• Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely.
• Attack Complexity: Low (AC:L) – No special conditions are required.
• Privileges Required: None (PR:N) – Unauthenticated attackers can exploit.
• User Interaction: None (UI:N) – No user action is needed.
• Scope: Unchanged (S:U) – The impact is confined to the vulnerable component.
• Confidentiality Impact: Low (C:L) – Limited information disclosure (e.g., ticket data).
• Integrity Impact: Low (I:L) – Attackers can modify or delete ticket files.
• Availability Impact: Low (A:L) – Potential for denial of service via file deletion.

Threat Level: Medium. While the CVSS score is 6.5, the ease of exploitation (no authentication) and the potential for data loss elevate the practical risk. The vulnerability is particularly dangerous for sites that handle sensitive ticket data.

Deep Dive & Mechanics

The vulnerability is located in the /class-ovaem-ajax.php file of the Ovatheme Events Manager plugin. This file registers several AJAX actions for both authenticated and unauthenticated users. The core issue is that functions such as ovaem_delete_ticket_file, ovaem_download_ticket, and others are hooked into WordPress AJAX actions without a preceding capability check (e.g., current_user_can()).

In WordPress, AJAX handlers are typically registered using add_action('wp_ajax_{action}', 'handler') for authenticated users and add_action('wp_ajax_nopriv_{action}', 'handler') for unauthenticated users. The plugin incorrectly registers sensitive actions under the nopriv hook, or fails to check user capabilities within the handler function itself. This means that any unauthenticated visitor can send a crafted POST request to /wp-admin/admin-ajax.php with the appropriate action parameter to trigger these functions.

For example, the ovaem_delete_ticket_file function likely accepts a file ID or path and deletes it without verifying that the requester is an administrator or has the manage_options capability. Similarly, ovaem_download_ticket may allow downloading any ticket file without authentication.

The attack flow:

1. Attacker identifies a WordPress site running the vulnerable plugin.
2. Attacker sends a POST request to /wp-admin/admin-ajax.php with action=ovaem_delete_ticket_file and a file identifier.
3. The plugin deletes the specified file.
4. Attacker can repeat for other actions like ovaem_download_ticket to exfiltrate data.

Vulnerable vs. Patched Code

Since no official patch exists, the vulnerable code is the current state. A hypothetical patch would involve adding capability checks to all AJAX handlers in /class-ovaem-ajax.php.

Vulnerable Code (example from class-ovaem-ajax.php):

add_action('wp_ajax_nopriv_ovaem_delete_ticket_file', 'ovaem_delete_ticket_file');
function ovaem_delete_ticket_file() {
    // No capability check
    $file_id = $_POST['file_id'];
    // Delete file logic
    wp_delete_file($file_id);
    wp_die();
}

Patched Code (hypothetical):

add_action('wp_ajax_ovaem_delete_ticket_file', 'ovaem_delete_ticket_file');
// Remove the nopriv hook
function ovaem_delete_ticket_file() {
    // Add capability check
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    $file_id = $_POST['file_id'];
    // Delete file logic
    wp_delete_file($file_id);
    wp_die();
}

The patch removes the nopriv hook (which allows unauthenticated access) and adds a current_user_can('manage_options') check to ensure only administrators can perform the action.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A WordPress instance with Ovatheme Events Manager plugin version <= 1.8.6.
• Knowledge of the AJAX action names (e.g., ovaem_delete_ticket_file, ovaem_download_ticket).

Exploitation Steps:

1. Reconnaissance: Identify the target WordPress site. Check for the plugin by looking for /wp-content/plugins/ova-events-manager/ or by observing page source for ovaem references.

2. Enumerate AJAX Actions: The plugin's AJAX actions can be found by examining the plugin source code or by fuzzing. Common actions include:

   • ovaem_delete_ticket_file
   • ovaem_download_ticket
   • ovaem_get_ticket_data

3. Craft Exploit Request: Use curl or a tool like Burp Suite to send a POST request.

   Example: Delete a ticket file:

   curl -X POST https://target.com/wp-admin/admin-ajax.php \
     -d "action=ovaem_delete_ticket_file&file_id=123"
   

   Example: Download a ticket:

   curl -X POST https://target.com/wp-admin/admin-ajax.php \
     -d "action=ovaem_download_ticket&ticket_id=456" \
     --output ticket.pdf
   

4. Automate: Use a script to iterate over file IDs or ticket IDs to maximize impact.

Lab Setup:

• Install WordPress locally (e.g., using Docker).
• Install Ovatheme Events Manager plugin version 1.8.6.
• Create a few test tickets and files.
• Execute the above curl commands to verify the vulnerability.

Blue Team (Detection & Defense)

Detection:

• Monitor for POST requests to /wp-admin/admin-ajax.php with suspicious action parameters (e.g., ovaem_delete_ticket_file, ovaem_download_ticket).
• Look for requests from unauthenticated users (no Cookie header with WordPress auth cookies).
• Alert on multiple rapid requests to these actions (potential brute-force of file IDs).

Defense:

• Immediate: Disable the plugin until a patch is available.
• Web Application Firewall (WAF): Create rules to block requests to admin-ajax.php with action parameters starting with ovaem_ from unauthenticated users.
• File Integrity Monitoring: Monitor the plugin directory for changes.
• Network Segmentation: If possible, restrict access to /wp-admin/ to trusted IPs.

Indicators of Compromise (IOCs)

• Network IOCs:

  • POST requests to /wp-admin/admin-ajax.php with action=ovaem_delete_ticket_file, action=ovaem_download_ticket, or similar.
  • Requests from IPs not associated with legitimate users.
  • Unusual file download patterns (e.g., downloading multiple ticket files in quick succession).

• File System IOCs:

  • Unexpected deletion of ticket files in the WordPress uploads directory.
  • Presence of new files in the uploads directory (if attacker uploads malicious files via other actions).
  • Modified plugin files (e.g., /wp-content/plugins/ova-events-manager/class-ovaem-ajax.php).

• Log IOCs:

  • WordPress debug log entries showing AJAX errors or unauthorized access attempts.
  • Web server access logs showing repeated POST requests to admin-ajax.php with ovaem_ actions.

Detection Engineering

YARA Rule

rule CVE_2025_7663_Ovatheme_Events_Manager {
    meta:
        description = "Detects vulnerable Ovatheme Events Manager plugin files"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-7663"
    strings:
        $ajax_handler = "wp_ajax_nopriv_ovaem_" nocase
        $delete_file = "ovaem_delete_ticket_file" nocase
        $download_ticket = "ovaem_download_ticket" nocase
    condition:
        $ajax_handler or $delete_file or $download_ticket
}

Sigma Rule

title: CVE-2025-7663 - Unauthenticated AJAX Actions in Ovatheme Events Manager
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects unauthenticated POST requests to WordPress admin-ajax.php with Ovatheme Events Manager actions.
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|all:
            - action=ovaem_delete_ticket_file
            - action=ovaem_download_ticket
    condition: selection
falsepositives:
    - Legitimate admin actions (if authenticated)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-7663 - Unauthenticated AJAX Action Ovatheme Events Manager";
    flow:to_server,established;
    content:"POST";
    http_method;
    content:"admin-ajax.php";
    http_uri;
    content:"action=ovaem_";
    http_client_body;
    nocase;
    sid:1000001;
    rev:1;
    reference:cve,2025-7663;
    priority:2;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the Plugin: Deactivate and delete the Ovatheme Events Manager plugin until a patched version is released.
2. Web Application Firewall (WAF): Implement rules to block unauthenticated requests to admin-ajax.php with ovaem_ action parameters.
3. Review Logs: Check web server and WordPress logs for signs of exploitation (e.g., unusual AJAX requests, file deletions).

Long-Term Actions:

1. Vendor Patch: Monitor the Ovatheme website or WordPress plugin repository for a security update. Apply it immediately when available.
2. Code Audit: If you have access to the plugin source, manually add capability checks to all AJAX handlers (as shown in the patched code example).
3. Alternative Plugin: Consider switching to a different events management plugin that is actively maintained and has a good security track record.
4. Principle of Least Privilege: Ensure that WordPress user roles are properly configured, and that only administrators have access to sensitive plugin functions.

Workaround (if plugin cannot be disabled):

• Use .htaccess to restrict access to admin-ajax.php to authenticated users only (note: this may break legitimate AJAX functionality for non-admin users).
• Implement a custom mu-plugin that hooks into the AJAX actions and adds capability checks.

Valters IT
Securing Digital Frontiers