CVE-2025-49922

Executive Summary

CVE-2025-49922 is a Missing Authorization vulnerability in the WPeMatico RSS Feed Fetcher plugin for WordPress, affecting versions up to and including 2.8.3. This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to RSS feed fetching functionality. The vulnerability is classified as a WordPress ecosystem issue, not related to Apache or Nginx.

The vulnerability has a CVSS score of 4.3 (Medium) and an EPSS score of 0.0%, indicating low exploitation probability at this time. No public proof-of-concept (PoC) or exploit code is available, and the vendor has not released a patch.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users should verify the integrity of their plugin files and monitor for updates. No known supply chain compromise has been reported.

CVSS Breakdown & Threat Level

• CVSS Score: 4.3 (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 threat level is Medium due to the low complexity and network-based attack vector, but the impact is limited to low confidentiality loss.

Deep Dive & Mechanics

The vulnerability resides in the WPeMatico RSS Feed Fetcher plugin's access control mechanisms. The plugin fails to properly validate user permissions when processing certain AJAX actions or REST API endpoints related to RSS feed fetching. This allows an unauthenticated attacker to:

1. Trigger RSS feed fetching operations without proper authorization.
2. Access sensitive configuration data or feed logs.
3. Potentially manipulate feed settings if the access control is misconfigured.

The core issue is a Missing Authorization check (CWE-862) in the plugin's code, where functions that should require administrative privileges are exposed to unauthenticated users.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is present in all versions <= 2.8.3. The following is a hypothetical example of the vulnerable code pattern:

Vulnerable Code (wpematico.php):

add_action('wp_ajax_nopriv_wpematico_fetch', 'wpematico_fetch_handler');
function wpematico_fetch_handler() {
    // Missing capability check
    $feed_id = $_POST['feed_id'];
    // Process feed fetch...
}

Patched Code (hypothetical):

add_action('wp_ajax_wpematico_fetch', 'wpematico_fetch_handler');
function wpematico_fetch_handler() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized');
    }
    $feed_id = $_POST['feed_id'];
    // Process feed fetch...
}

The patch would require adding a capability check (e.g., current_user_can('manage_options')) and changing the action hook from wp_ajax_nopriv_ to wp_ajax_ to restrict access to authenticated users.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target WordPress site with WPeMatico <= 2.8.3 installed and activated.
• Network access to the target.

Exploitation Steps:

1. Identify the vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=wpematico_fetch).
2. Send a crafted POST request without authentication:

   curl -X POST http://target/wp-admin/admin-ajax.php \
     -d "action=wpematico_fetch&feed_id=1"
   

3. Observe the response for unauthorized access to feed data.

Note: No public exploit code is available; this is a conceptual demonstration.

Blue Team

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with action=wpematico_* parameters from unauthenticated sources.
• Look for repeated requests to feed fetching endpoints without proper session cookies.

Hunting:

• Search web server logs for patterns like:

  POST /wp-admin/admin-ajax.php HTTP/1.1
  action=wpematico_fetch
  

• Correlate with IP addresses that have no prior authentication attempts.

Indicators of Compromise (IOCs)

• Network:
  • POST requests to /wp-admin/admin-ajax.php with action=wpematico_fetch or similar.
  • Unauthenticated access to /wp-json/wpematico/v1/ endpoints (if REST API is used).
• File:
  • Modified or unexpected files in /wp-content/plugins/wpematico/ directory.
• Log:
  • Web server logs showing 200 responses to unauthenticated AJAX requests to WPeMatico actions.

Detection Engineering

YARA Rule

rule CVE_2025_49922_WPeMatico_Missing_Auth {
    meta:
        description = "Detects vulnerable WPeMatico plugin files with missing authorization"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "CVE-2025-49922"
        hash = "unknown"
    strings:
        $vuln_func = "wp_ajax_nopriv_wpematico" nocase
        $vuln_hook = "wpematico_fetch" nocase
    condition:
        $vuln_func or $vuln_hook
}

Sigma Rule

title: CVE-2025-49922 - WPeMatico Missing Authorization Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated AJAX requests to WPeMatico endpoints
author: Valters IT
date: 2025-04-01
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'action=wpematico_'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate admin requests (rare)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-49922 WPeMatico Missing Authorization Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=wpematico_"; http_client_body; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin if not essential: Deactivate and delete WPeMatico from the WordPress admin panel.
2. Implement a Web Application Firewall (WAF) rule to block unauthenticated requests to admin-ajax.php with action=wpematico_* parameters.
3. Restrict access to /wp-admin/admin-ajax.php via .htaccess or server configuration:

   <Files "admin-ajax.php">
       Require all denied
       Require ip 127.0.0.1
   </Files>
   

Long-term Fix:

• Monitor the vendor's website for a patched version (expected > 2.8.3).
• Apply the patch manually by adding capability checks to all AJAX handlers in the plugin.

Workaround:

• Use a security plugin (e.g., Wordfence) to add virtual patching for this vulnerability.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert
Report generated for CVE-2025-49922