CVE-2025-23994: Estatebud Properties XSS Vulnerability

CVE-2025-23994 Overview

CVE-2025-23994 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the Estatebud – Properties & Listings WordPress plugin. This vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject and persist malicious scripts within the application. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact

Attackers can inject persistent malicious scripts that execute in the browsers of users viewing affected pages, potentially leading to session hijacking, credential theft, or malware distribution across all visitors to the affected WordPress site.

Affected Products

• Estatebud – Properties & Listings WordPress plugin versions up to and including 5.5.0
• WordPress installations running the vulnerable plugin versions
• Sites utilizing property listing functionality provided by this plugin

Discovery Timeline

• 2025-01-21 - CVE-2025-23994 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23994

Vulnerability Analysis

This Stored XSS vulnerability allows attackers to inject malicious JavaScript code that persists within the WordPress database and executes whenever users view the affected content. The vulnerability is particularly concerning because it can be chained with a Cross-Site Request Forgery (CSRF) attack, enabling unauthenticated attackers to exploit the vulnerability by tricking authenticated users into triggering the malicious payload injection.

The network-accessible nature of this vulnerability means attackers can exploit it remotely without requiring prior authentication to the WordPress installation. However, successful exploitation does require user interaction, specifically that a victim must view a page containing the injected malicious script.

Root Cause

The root cause of this vulnerability lies in insufficient input sanitization and output encoding within the Estatebud – Properties & Listings plugin. User-supplied input is not properly validated or escaped before being stored in the database and subsequently rendered in web pages. This allows HTML and JavaScript content to be persisted and executed in the context of other users' browsers.

Attack Vector

The attack leverages the network attack vector with low complexity requirements. An attacker can craft malicious input containing JavaScript payloads and submit it through vulnerable form fields or API endpoints exposed by the plugin. The CSRF component suggests that administrative functionality lacks proper token validation, allowing attackers to construct malicious links or pages that, when visited by an authenticated administrator, will submit the XSS payload on their behalf.

Once the malicious script is stored, any user visiting a page that renders the compromised property listing data will have the script execute in their browser context. This can lead to cookie theft, session hijacking, keylogging, phishing attacks, or redirection to malicious sites.

Detection Methods for CVE-2025-23994

Indicators of Compromise

• Unusual JavaScript code present in property listing content or plugin database tables
• Unexpected script tags or event handlers (e.g., onerror, onload, onclick) in stored property data
• Browser security console warnings about inline script execution or Content Security Policy violations
• User reports of unexpected behavior when viewing property listings
• Suspicious entries in web server access logs showing encoded script patterns in form submissions

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block XSS payloads in HTTP requests
• Deploy content security monitoring to identify script injection attempts in database content
• Utilize WordPress security plugins that scan for malicious code injection in plugin data
• Monitor for CSRF attack patterns targeting plugin administrative endpoints
• Enable browser Content Security Policy headers to prevent inline script execution

Monitoring Recommendations

• Regularly audit database content for suspicious HTML/JavaScript patterns in plugin-related tables
• Configure real-time alerting for modifications to property listing content outside normal workflows
• Review access logs for unusual POST requests to plugin endpoints, especially from external referrers
• Monitor for spike in requests to plugin administrative functions from unexpected sources
• Implement integrity monitoring for plugin files and database content

How to Mitigate CVE-2025-23994

Immediate Actions Required

• Update the Estatebud – Properties & Listings plugin beyond version 5.5.0 as soon as a patched version becomes available
• Review all existing property listings and plugin-stored data for signs of injected malicious content
• Implement Content Security Policy (CSP) headers to mitigate the impact of any successful XSS exploitation
• Enable WordPress security plugins with XSS detection capabilities
• Consider temporarily disabling the plugin if it is not critical to site operations until a patch is available

Patch Information

Users should monitor the Patchstack WordPress Vulnerability Database for official patch information and updates from the plugin vendor. The vulnerability affects all versions through 5.5.0, and users should upgrade to a version higher than 5.5.0 when available.

Workarounds

• Deploy a Web Application Firewall (WAF) with XSS filtering rules to block malicious payloads at the network edge
• Implement strict Content Security Policy headers including script-src 'self' to prevent inline script execution
• Restrict access to plugin administrative functions to trusted IP addresses only
• Add custom input validation and output encoding through WordPress filters if technically feasible
• Temporarily disable public-facing property submission features if the plugin allows user-generated content

# WordPress .htaccess security configuration example
# Add to .htaccess to help mitigate XSS attacks

# Set Content Security Policy header
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
    Header set X-Content-Type-Options "nosniff"
    Header set X-XSS-Protection "1; mode=block"
</IfModule>

# Block requests with suspicious script patterns
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{QUERY_STRING} (<|%3C).*script.*(>|%3E) [NC,OR]
    RewriteCond %{QUERY_STRING} GLOBALS(=|[|%[0-9A-Z]{0,2}) [OR]
    RewriteCond %{QUERY_STRING} _REQUEST(=|[|%[0-9A-Z]{0,2})
    RewriteRule .* - [F,L]
</IfModule>