CVE-2015-20119: RealtyScript Stored XSS Vulnerability

CVE-2015-20119 Overview

Next Click Ventures RealtyScript 4.0.2 contains a stored cross-site scripting (XSS) vulnerability that allows authenticated attackers to inject malicious HTML and iframe elements through the text parameter in the pages.php admin interface. Attackers can submit POST requests to the add page action with crafted iframe payloads in the text parameter to store malicious content that executes in the browsers of users viewing the affected pages.

Critical Impact

Authenticated attackers can inject persistent malicious scripts that execute in victims' browsers, potentially leading to session hijacking, credential theft, or delivery of further attacks against administrative and regular users of the RealtyScript platform.

Affected Products

• Next Click Ventures RealtyScript version 4.0.2
• RealtyScript admin interface (pages.php)
• Web-based real estate management platforms using vulnerable RealtyScript versions

Discovery Timeline

• 2026-03-16 - CVE CVE-2015-20119 published to NVD
• 2026-03-19 - Last updated in NVD database

Technical Details for CVE-2015-20119

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting (XSS). The stored nature of this XSS vulnerability makes it particularly dangerous as the malicious payload persists in the application's database and executes every time a victim views the affected page.

The vulnerability exists within the administrative interface of RealtyScript, specifically in the pages.php endpoint. When an authenticated administrator creates or modifies a page, the application fails to properly sanitize the text parameter before storing it in the database. This lack of input validation allows attackers with administrative access to inject arbitrary HTML content, including iframe elements and script tags.

The attack requires low privileges (authenticated access) and relies on user interaction (victim viewing the affected page), but once the payload is stored, it can affect multiple users over an extended period without additional attacker involvement.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the RealtyScript page management functionality. The application accepts user-supplied HTML content through the text parameter in POST requests to the pages.php add action and stores this content directly in the database without proper sanitization. When the stored content is later rendered to users, the malicious HTML and JavaScript execute in the context of the victim's browser session.

Attack Vector

The attack is network-based and requires authenticated access to the RealtyScript admin panel. An attacker with valid administrative credentials can exploit this vulnerability by:

1. Authenticating to the RealtyScript administrative interface
2. Navigating to the page management section (pages.php)
3. Creating or editing a page with malicious iframe or script content in the text parameter
4. Submitting the POST request with the crafted payload
5. Waiting for other users (administrators or visitors) to view the affected page

The malicious content could include hidden iframes loading external content, JavaScript stealing session cookies, or phishing forms designed to capture user credentials. Detailed technical information about the exploitation technique can be found in the Zero Science Vulnerability Advisory ZSL-2015-5269 and the Exploit-DB entry #38496.

Detection Methods for CVE-2015-20119

Indicators of Compromise

• Presence of unexpected iframe tags or script elements in stored page content within the RealtyScript database
• Unusual POST requests to pages.php containing HTML tags or JavaScript in the text parameter
• User reports of unexpected redirects, pop-ups, or browser warnings when viewing RealtyScript pages
• Suspicious outbound network connections from client browsers after visiting the application

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing malicious HTML or JavaScript in form parameters
• Deploy Content Security Policy (CSP) headers to prevent execution of unauthorized inline scripts and restrict iframe sources
• Monitor application logs for POST requests to pages.php containing suspicious patterns such as <iframe, <script, or event handlers like onerror
• Conduct regular database audits to identify stored content containing potentially malicious HTML elements

Monitoring Recommendations

• Enable detailed logging for all administrative actions in RealtyScript, particularly page creation and modification operations
• Set up alerts for CSP violation reports that may indicate attempted XSS exploitation
• Monitor for unusual patterns in page edit frequency or bulk modifications by single users
• Implement real-time log analysis to detect injection attempt patterns across the application

How to Mitigate CVE-2015-20119

Immediate Actions Required

• Audit all existing pages in the RealtyScript database for malicious HTML or iframe content
• Restrict administrative access to trusted users only and enforce strong authentication practices
• Implement a Web Application Firewall (WAF) with XSS protection rules in front of the RealtyScript application
• Deploy Content Security Policy headers to limit the execution of inline scripts and restrict frame sources

Patch Information

No official vendor patch information is available in the CVE data. Organizations using RealtyScript 4.0.2 should contact Next Click Ventures directly to inquire about security updates or consider migrating to alternative real estate management platforms with active security support.

For additional context, review the VulnCheck Advisory for the latest information regarding this vulnerability.

Workarounds

• Implement server-side input validation to strip or encode HTML tags from the text parameter before database storage
• Apply output encoding to all user-supplied content when rendering pages to prevent script execution
• Use HTML sanitization libraries to whitelist only safe HTML tags and attributes in page content
• Restrict the ability to add custom HTML to pages to a minimal set of highly trusted administrators

# Example Apache configuration to add Content-Security-Policy headers
# Add to .htaccess or Apache virtual host configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; frame-src 'none'; object-src 'none'"
Header set X-Content-Type-Options "nosniff"
Header set X-XSS-Protection "1; mode=block"