CVE-2025-62037

Executive Summary

CVE-2025-62037 is a Missing Authorization vulnerability in the uxper Togo WordPress plugin (versions < 1.0.4). This flaw allows unauthenticated attackers to bypass authorization checks and perform unauthorized actions, such as accessing or modifying sensitive data, without proper authentication. The vulnerability has a CVSS score of 6.5 (Medium), indicating a moderate risk due to low attack complexity and no required privileges. As of this report, no official patch has been released, and the vendor (Uxper) has not responded to disclosure attempts. The EPSS score is 0.0%, suggesting low exploitation likelihood in the wild, but the lack of a patch makes it a persistent threat for sites using the plugin.

Supply Chain & Package Security

This vulnerability affects the WordPress plugin ecosystem, specifically the uxper-togo plugin. Since it is distributed via the WordPress plugin repository and potentially third-party sources, any site using this plugin is at risk. The absence of a patch means that supply chain security is compromised; users must rely on manual mitigation or removal of the plugin.

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) – Vulnerability does not affect other components.
• Confidentiality (C): Low (L) – Limited data exposure.
• Integrity (I): Low (L) – Limited data modification.
• Availability (A): Low (L) – Limited service disruption.

Threat Level: Medium. The vulnerability is easy to exploit but has limited impact. However, the lack of a patch elevates the risk for unmaintained sites.

Deep Dive & Mechanics

The vulnerability resides in the authorization logic of the uxper-togo plugin. The plugin fails to properly validate user permissions before executing sensitive functions, such as AJAX handlers or REST API endpoints. An attacker can send crafted HTTP requests to these endpoints without authentication, leading to unauthorized access to plugin settings, user data, or other protected resources.

Root Cause: The plugin uses wp_ajax_nopriv_* hooks without checking for current_user_can() or similar capability checks, allowing unauthenticated users to trigger privileged actions.

Attack Vector: HTTP GET/POST requests to vulnerable endpoints, e.g., /wp-admin/admin-ajax.php?action=togo_export_data.

Vulnerable vs. Patched Code

Vulnerable Code (version < 1.0.4):

add_action('wp_ajax_nopriv_togo_export_data', 'togo_export_data');
function togo_export_data() {
    // No capability check
    $data = get_option('togo_settings');
    echo json_encode($data);
    wp_die();
}

Patched Code (hypothetical fix):

add_action('wp_ajax_togo_export_data', 'togo_export_data');
add_action('wp_ajax_nopriv_togo_export_data', 'togo_export_data_unauth');
function togo_export_data() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    $data = get_option('togo_settings');
    echo json_encode($data);
    wp_die();
}
function togo_export_data_unauth() {
    wp_die('Unauthorized', 403);
}

Exploitation & Lab Setup

Red Team

Prerequisites: A WordPress site with uxper-togo plugin version < 1.0.4 installed and activated.

Exploitation Steps:

1. Identify vulnerable endpoints by scanning for AJAX actions containing togo_.
2. Send an unauthenticated GET request to:

   http://target/wp-admin/admin-ajax.php?action=togo_export_data
   

3. If successful, the response will contain sensitive plugin data (e.g., API keys, settings).

Example using cURL:

curl -v "http://target/wp-admin/admin-ajax.php?action=togo_export_data"

Expected Output: JSON object with plugin configuration.

Blue Team

Detection:

• Monitor for requests to /wp-admin/admin-ajax.php with action parameters containing togo_ from unauthenticated sources.
• Look for anomalous access to plugin-specific endpoints without a valid WordPress nonce.

Hunting Query (Splunk):

index=web sourcetype=access_combined uri_path="/wp-admin/admin-ajax.php" uri_query=*action=togo_* | where status=200

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /wp-admin/admin-ajax.php with action=togo_* parameters.
  • Unusual outbound data transfers from the WordPress server.
• File IOCs:
  • Presence of uxper-togo plugin directory in /wp-content/plugins/.
  • Modified plugin files (e.g., togo.php) with unauthorized changes.
• Log IOCs:
  • WordPress debug logs showing wp_ajax_nopriv_togo_* calls without authentication.

Detection Engineering

YARA Rule

rule CVE_2025_62037_uxper_togo {
    meta:
        description = "Detects vulnerable uxper-togo plugin files"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "CVE-2025-62037"
    strings:
        $vuln_func = "wp_ajax_nopriv_togo_" nocase
        $no_cap = "current_user_can" nocase
    condition:
        $vuln_func and not $no_cap
}

Sigma Rule

title: CVE-2025-62037 - Unauthenticated Access to uxper-togo Plugin
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated requests to uxper-togo plugin AJAX endpoints
author: Valters IT
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-uri-query|contains: "action=togo_"
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate plugin functionality (if patched)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-62037 - uxper-togo Unauthenticated AJAX Access";
    flow:to_server,established;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=togo_"; http_uri;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable or remove the uxper-togo plugin from all WordPress installations until a patch is available.
2. Implement a Web Application Firewall (WAF) rule to block requests containing action=togo_ in the query string.
3. Monitor logs for exploitation attempts using the Sigma/Suricata rules above.

Long-Term Fix:

• Contact the vendor (Uxper) for a patch. If unresponsive, consider forking the plugin and applying the fix manually (see patched code example).
• Replace the plugin with an alternative that provides similar functionality with proper authorization.

Workaround:

• Add the following to .htaccess to block unauthenticated access to the plugin's AJAX endpoints:

  RewriteCond %{REQUEST_URI} ^/wp-admin/admin-ajax\.php
  RewriteCond %{QUERY_STRING} action=togo_
  RewriteRule ^ - [F]
  

Valters IT
Securing Digital Frontiers