CVE-2025-1249

Executive Summary

CVE-2025-1249 is a Missing Authorization vulnerability in the Events Manager WordPress plugin (developed by Marcus, aka @msykes). This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to sensitive event data or administrative functions. The vulnerability affects all versions up to and including 6.6.4.1. No official patch has been released, and the vendor has not responded to disclosure attempts. The EPSS score is 0.0%, indicating low exploitation likelihood in the wild, but the risk remains for sites with exposed endpoints.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin via the WordPress dashboard or manually are affected. No known supply chain compromise has been reported, but the lack of a patch increases the risk of malicious actors leveraging this flaw in targeted attacks.

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 classified as Medium severity due to the low complexity and lack of authentication required, but the impact is limited to low confidentiality loss (e.g., exposure of event details or user data).

Deep Dive & Mechanics

The Events Manager plugin provides functionality for managing events, bookings, and locations. The missing authorization vulnerability likely exists in one or more AJAX endpoints or REST API routes that fail to properly verify user capabilities before processing requests. Attackers can send crafted HTTP requests to these endpoints without authentication, potentially retrieving private event data, modifying settings, or accessing administrative functions.

The root cause is a failure to implement proper capability checks (e.g., current_user_can()) in functions that handle sensitive operations. This is a classic CWE-862: Missing Authorization issue.

Vulnerable vs. Patched Code

Since no official patch exists, the vulnerable code remains in all versions <= 6.6.4.1. A hypothetical patch would involve adding authorization checks to all AJAX and REST endpoints. For example:

Vulnerable Code (hypothetical):

add_action('wp_ajax_nopriv_events_manager_get_private_data', 'em_get_private_data');
function em_get_private_data() {
    // No capability check
    $data = get_option('em_private_data');
    wp_send_json_success($data);
}

Patched Code (hypothetical):

add_action('wp_ajax_nopriv_events_manager_get_private_data', 'em_get_private_data');
function em_get_private_data() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    $data = get_option('em_private_data');
    wp_send_json_success($data);
}

Exploitation & Lab Setup

Red Team

To exploit this vulnerability, an attacker would:

1. Identify vulnerable endpoints by analyzing the plugin's source code or using fuzzing tools.
2. Send unauthenticated GET/POST requests to endpoints like /wp-admin/admin-ajax.php?action=em_get_private_data.
3. Retrieve sensitive data or perform unauthorized actions.

Example cURL command:

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

Blue Team

To detect exploitation attempts:

• Monitor for unusual requests to admin-ajax.php with action parameters related to Events Manager (e.g., em_*).
• Look for requests from unauthenticated users to endpoints that should require authentication.
• Use the detection rules provided below.

Indicators of Compromise (IOCs)

• Network: HTTP requests to /wp-admin/admin-ajax.php with action=em_* parameters from unauthenticated sources.
• Logs: WordPress debug logs showing failed capability checks or unexpected access to plugin functions.
• File: Modified plugin files (e.g., events-manager/events-manager.php) if an attacker uploads a backdoor.

Detection Engineering

YARA Rule

rule Detect_CVE_2025_1249_Exploit {
    meta:
        description = "Detects exploitation attempts for CVE-2025-1249 in Events Manager plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-1249"
    strings:
        $action = "action=em_" nocase
        $ajax = "admin-ajax.php" nocase
    condition:
        $ajax and $action
}

Sigma Rule

title: CVE-2025-1249 Exploitation Attempt
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects unauthenticated requests to Events Manager AJAX endpoints
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|contains: 'action=em_'
    condition: selection
falsepositives:
    - Legitimate plugin AJAX calls from authenticated users
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-1249 Events Manager Missing Authorization Exploit"; flow:to_server,established; content:"POST"; http_method; content:"admin-ajax.php"; http_uri; content:"action=em_"; http_client_body; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Since no official patch is available, the following mitigations are recommended:

1. Disable the plugin if not essential, or replace it with an alternative.
2. Implement a Web Application Firewall (WAF) rule to block unauthenticated requests to admin-ajax.php with action=em_* parameters.
3. Restrict access to the /wp-admin/ directory using IP whitelisting or .htaccess authentication.
4. Monitor logs for suspicious activity and apply virtual patching if using a security solution.
5. Contact the vendor to request a patch or consider forking the plugin to apply a fix.

Valters IT
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