CVE-2025-30887

Executive Summary

CVE-2025-30887 is a Missing Authorization vulnerability in the WpEvently (mage-eventpress) WordPress plugin by Magepeopleteam. This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized data access or function execution. The vulnerability affects all versions from n/a through 4.2.9. 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 likelihood currently, 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. No known supply chain compromise has been reported, but the absence of a patch means users must rely on manual mitigation.

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
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low
• Integrity Impact: None
• Availability Impact: None

The vulnerability is exploitable remotely without authentication, but only leads to limited information disclosure. The threat level is Medium due to the ease of exploitation and potential for data leakage.

Deep Dive & Mechanics

The WpEvently plugin provides event management functionality for WordPress sites. The missing authorization vulnerability likely exists in one or more AJAX actions or REST API endpoints that fail to properly verify user capabilities before processing requests. Attackers can send crafted HTTP requests to these endpoints to access sensitive data (e.g., event details, attendee information) or perform unauthorized actions.

The core issue is that the plugin does not implement proper capability checks (e.g., current_user_can()) in functions that handle privileged operations. This allows any unauthenticated user to trigger these functions.

Vulnerable vs. Patched Code

Since no patch is available, a hypothetical fix would involve adding authorization checks. Below is an example of vulnerable vs. patched code.

Vulnerable Code (hypothetical):

add_action('wp_ajax_nopriv_mage_get_events', 'mage_get_events');
function mage_get_events() {
    $events = get_posts(array('post_type' => 'event', 'posts_per_page' => -1));
    wp_send_json($events);
}

Patched Code (hypothetical):

add_action('wp_ajax_nopriv_mage_get_events', 'mage_get_events');
function mage_get_events() {
    if (!current_user_can('read')) {
        wp_die('Unauthorized', 403);
    }
    $events = get_posts(array('post_type' => 'event', 'posts_per_page' => -1));
    wp_send_json($events);
}

Exploitation & Lab Setup

Red Team

1. Setup: Install WordPress with WpEvently plugin version 4.2.9 on a local server.
2. Recon: Identify vulnerable endpoints by analyzing plugin source code or using a tool like Burp Suite to spider the site.
3. Exploit: Send a crafted HTTP request to a vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=mage_get_events).
4. Example Request:

curl -X POST http://target/wp-admin/admin-ajax.php \
  -d "action=mage_get_events"

5. Expected Output: JSON data containing event details.

Blue Team

1. Detection: Monitor for unusual AJAX requests to admin-ajax.php with actions related to WpEvently (e.g., mage_*).
2. Log Analysis: Check web server logs for requests from unauthenticated users to plugin-specific endpoints.
3. Mitigation: Implement a Web Application Firewall (WAF) rule to block requests to known vulnerable endpoints unless authenticated.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP POST requests to /wp-admin/admin-ajax.php with action parameter containing mage_ prefix.
  • Unusual JSON responses containing event data from unauthenticated requests.
• File IOCs:
  • Presence of WpEvently plugin version <= 4.2.9 in /wp-content/plugins/mage-eventpress/.
• Log IOCs:
  • Repeated 200 responses to admin-ajax.php from IPs without prior login.

Detection Engineering

YARA Rule

rule CVE_2025_30887_WpEvently_Missing_Auth {
    meta:
        description = "Detects WpEvently plugin files with missing authorization vulnerability"
        author = "Valters IT"
        date = "2025-04-17"
        cve = "CVE-2025-30887"
    strings:
        $vuln_func = "wp_ajax_nopriv_" nocase
        $plugin_path = "mage-eventpress" nocase
    condition:
        $plugin_path and #vuln_func > 0
}

Sigma Rule

title: CVE-2025-30887 - WpEvently Missing Authorization Exploitation
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects unauthenticated AJAX requests to WpEvently plugin endpoints
author: Valters IT
date: 2025-04-17
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|contains: 'action=mage_'
    condition: selection
falsepositives:
    - Legitimate plugin functionality (rare)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-30887 - WpEvently Missing Authorization Exploit"; flow:to_server; content:"POST"; http_method; content:"admin-ajax.php"; http_uri; content:"action=mage_"; 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 Web Application Firewall (WAF) rule to block unauthenticated requests to admin-ajax.php with action parameters starting with mage_.
3. Code Fix: Add proper capability checks (e.g., current_user_can('edit_posts')) to all AJAX handlers.
4. Monitoring: Enable logging for AJAX requests and review for suspicious activity.
5. Update: Monitor the plugin's official page for a patched version and apply it immediately when available.

Valters IT
Securing Digital Frontiers