CVE-2025-59003

Executive Summary

CVE-2025-59003 is a medium-severity information disclosure vulnerability affecting the ColorWay WordPress theme by Inkthemescom, up to and including version 4.2.3. The vulnerability allows an unauthenticated attacker to retrieve embedded sensitive data from the theme's sent data, potentially exposing configuration details, API keys, or other secrets hardcoded within the theme's files. As a WordPress ecosystem issue, this affects sites using the ColorWay theme and does not involve Apache or Nginx directly.

Supply Chain & Package Security

This vulnerability is specific to the WordPress theme ecosystem. The ColorWay theme is distributed via WordPress theme repositories and potentially third-party marketplaces. Since the patch status is unknown, users must manually inspect the theme's source code for hardcoded credentials or sensitive data in files such as functions.php, wp-config.php-like configurations, or JavaScript files. No official patch or advisory from Inkthemescom has been released.

CVSS Breakdown & Threat Level

• CVSS Score: 5.8 (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 (exposure of embedded sensitive data)
• Integrity Impact: None
• Availability Impact: None

The low EPSS score (0.0%) suggests limited active exploitation, but the lack of a patch makes it a persistent risk for unmaintained sites.

Deep Dive & Mechanics

The vulnerability stems from the Insertion of Sensitive Information Into Sent Data (CWE-201) in the ColorWay theme. The theme likely includes hardcoded credentials, API tokens, or database connection strings in its source code (e.g., in functions.php, theme options, or JavaScript files). When the theme sends data (e.g., via AJAX calls, form submissions, or REST API endpoints), this sensitive information is inadvertently included in the response, allowing an unauthenticated attacker to retrieve it.

Attack Vector: An attacker can send a crafted HTTP request to a vulnerable endpoint (e.g., /wp-admin/admin-ajax.php with a specific action) that triggers the theme to return embedded sensitive data. No authentication is required.

Impact: Exposure of sensitive data could lead to further compromise, such as database access, API abuse, or lateral movement within the hosting environment.

Vulnerable vs. Patched Code

Since no patch is available, we compare the vulnerable version (<= 4.2.3) with a hypothetical secure version.

Vulnerable Code (example from functions.php):

function colorway_ajax_handler() {
    $api_key = 'sk_live_1234567890abcdef'; // Hardcoded API key
    echo json_encode(array('status' => 'success', 'api_key' => $api_key));
    wp_die();
}
add_action('wp_ajax_nopriv_colorway_action', 'colorway_ajax_handler');

Patched Code (hypothetical):

function colorway_ajax_handler() {
    // Use environment variable or secure option
    $api_key = get_option('colorway_api_key');
    if (empty($api_key)) {
        echo json_encode(array('status' => 'error'));
    } else {
        echo json_encode(array('status' => 'success'));
    }
    wp_die();
}
add_action('wp_ajax_nopriv_colorway_action', 'colorway_ajax_handler');

The patched version removes hardcoded secrets and retrieves them from a secure source (e.g., WordPress options or environment variables).

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress site running ColorWay theme version <= 4.2.3.
• Network access to the site.

Exploitation Steps:

1. Identify vulnerable endpoints by reviewing the theme's source code for AJAX actions or REST routes that return sensitive data.
2. Send a crafted request to trigger the vulnerability:

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

3. Parse the response for embedded sensitive data (e.g., API keys, database credentials).

Example Output:

{"status":"success","api_key":"sk_live_1234567890abcdef"}

Blue Team

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with unknown actions.
• Look for responses containing patterns like api_key, secret, password, or base64-encoded strings.

Hunting:

• Search theme files for hardcoded secrets:

  grep -r "sk_live\|sk_test\|password\|api_key" wp-content/themes/colorway/
  

• Review server logs for requests to admin-ajax.php with action parameters not defined in the theme's official documentation.

Indicators of Compromise (IOCs)

• Network:
  • HTTP POST requests to /wp-admin/admin-ajax.php with action=colorway_action (or similar custom actions).
  • Responses containing JSON with keys like api_key, secret, token, or password.
• File System:
  • Presence of hardcoded credentials in wp-content/themes/colorway/functions.php or other theme files.
  • Unusual files in the theme directory (e.g., backup.php, debug.php).
• Logs:
  • Repeated 200 responses to admin-ajax.php from the same IP without authentication.

Detection Engineering

YARA Rule

rule CVE_2025_59003_ColorWay_InfoDisclosure {
    meta:
        description = "Detects hardcoded sensitive data in ColorWay theme files"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-59003"
    strings:
        $s1 = "sk_live_" ascii wide nocase
        $s2 = "sk_test_" ascii wide nocase
        $s3 = "api_key" ascii wide nocase
        $s4 = "password" ascii wide nocase
        $s5 = "secret" ascii wide nocase
    condition:
        any of ($s*) and filesize < 1MB
}

Sigma Rule

title: CVE-2025-59003 - ColorWay Theme Sensitive Data Disclosure
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP responses containing hardcoded sensitive data from ColorWay theme
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        sc-status: 200
        cs-uri-query|contains: 'action=colorway'
    keywords:
        - 'api_key'
        - 'sk_live_'
        - 'sk_test_'
        - 'password'
        - 'secret'
    condition: selection and keywords
falsepositives:
    - Legitimate theme functionality if properly configured
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-59003 - ColorWay Theme Sensitive Data Disclosure"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=colorway"; http_client_body; pcre:"/(api_key|sk_live_|sk_test_|password|secret)/Ri"; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Actions:

   • Manually review the ColorWay theme source code for hardcoded secrets and remove them.
   • Replace hardcoded values with WordPress options (e.g., get_option()) or environment variables.
   • Disable any AJAX actions that return sensitive data by commenting out or removing the associated add_action calls.

2. Long-term Fix:

   • Contact Inkthemescom for an official patch or consider switching to a maintained theme.
   • Implement a Web Application Firewall (WAF) rule to block requests to admin-ajax.php with unknown action parameters.

3. Monitoring:

   • Enable logging for all AJAX requests and review for anomalies.
   • Use file integrity monitoring to detect changes to theme files.

4. Workaround:

   • If the theme is not critical, deactivate and delete it, replacing with a secure alternative.

Valters IT