CVE-2015-20114: RealtyScript XSS Vulnerability

CVE-2015-20114 Overview

CVE-2015-20114 is a Cross-Site Scripting (XSS) vulnerability affecting Next Click Ventures RealtyScript 4.0.2, a web-based real estate listing management application. The vulnerability allows attackers to execute arbitrary HTML and JavaScript code by injecting malicious input through multiple parameters that are not properly sanitized. When exploited, attackers can craft requests with injected script payloads in vulnerable parameters to execute code in users' browser sessions within the context of the affected application.

Critical Impact

Successful exploitation allows attackers to steal session cookies, hijack user accounts, redirect users to malicious sites, or perform unauthorized actions on behalf of authenticated users within the RealtyScript application.

Affected Products

• Next Click Ventures RealtyScript 4.0.2
• RealtyScript web application (real estate listing platform)
• Web browsers accessing affected RealtyScript installations

Discovery Timeline

• 2026-03-16 - CVE CVE-2015-20114 published to NVD
• 2026-03-19 - Last updated in NVD database

Technical Details for CVE-2015-20114

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The flaw exists because RealtyScript 4.0.2 fails to properly sanitize user-supplied input across multiple parameters before incorporating that input into dynamically generated web pages. When a user visits a crafted URL or submits malicious form data, the injected script executes in the victim's browser session with the same privileges as legitimate application content.

The attack requires user interaction, as victims must click a malicious link or visit a compromised page that delivers the XSS payload. Once executed, the malicious script operates within the security context of the RealtyScript domain, enabling access to session tokens, DOM content, and the ability to make authenticated requests on behalf of the victim.

Root Cause

The root cause of CVE-2015-20114 is insufficient input validation and output encoding in RealtyScript 4.0.2. Multiple parameters throughout the application accept user input without proper sanitization, and this input is subsequently rendered in HTML responses without adequate encoding. This allows specially crafted payloads containing HTML tags and JavaScript to be interpreted as executable code rather than being displayed as plain text.

Attack Vector

The attack vector for this vulnerability is network-based, requiring an attacker to deliver a malicious link or manipulate form submissions to a RealtyScript installation. The attacker constructs a URL or POST request containing JavaScript payloads in vulnerable parameters. When a victim user accesses the crafted request, the RealtyScript application reflects the malicious input back to the browser, which executes the embedded script.

The vulnerability mechanism involves multiple unsanitized parameters that can be exploited to inject script content. For detailed technical information about the specific vulnerable parameters and proof-of-concept examples, refer to the Zero Science Vulnerability Report or the Exploit-DB #38496 entry.

Detection Methods for CVE-2015-20114

Indicators of Compromise

• Unusual URL patterns containing encoded JavaScript or HTML tags in query parameters targeting RealtyScript pages
• Web server logs showing requests with <script> tags, javascript: URIs, or event handlers like onerror, onload in URL parameters
• User reports of unexpected browser behavior, redirects, or credential prompts when accessing RealtyScript
• Session anomalies indicating potential session hijacking or unauthorized access following user visits to external links

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common XSS patterns in requests to RealtyScript installations
• Implement Content Security Policy (CSP) headers to restrict inline script execution and detect policy violations
• Monitor web application logs for suspicious parameter values containing script tags, event handlers, or encoded JavaScript
• Use browser-based XSS auditor reports and security headers to identify potential injection attempts

Monitoring Recommendations

• Enable detailed access logging on web servers hosting RealtyScript to capture full request URLs and POST bodies
• Configure SIEM alerts for patterns indicative of XSS attacks, such as encoded angle brackets or javascript: strings in parameters
• Monitor for CSP violation reports, which may indicate attempted XSS exploitation
• Track user session behavior for anomalies that could suggest session token theft

How to Mitigate CVE-2015-20114

Immediate Actions Required

• Assess whether RealtyScript 4.0.2 is deployed in your environment and identify all instances
• Implement input validation and output encoding at the web server or WAF level as an interim measure
• Deploy Content Security Policy headers with strict inline script restrictions to reduce XSS impact
• Educate users about the risks of clicking unknown links that target the RealtyScript application

Patch Information

No vendor patch information is currently available in the CVE data. Organizations should contact Next Click Ventures directly for updated software versions that address this vulnerability. In the absence of an official patch, consider implementing workarounds and defense-in-depth measures to mitigate risk. For additional details, consult the VulnCheck Advisory on RealtyScript.

Workarounds

• Deploy a Web Application Firewall (WAF) with XSS filtering rules in front of RealtyScript installations
• Implement strict Content Security Policy headers to prevent inline script execution: Content-Security-Policy: default-src 'self'; script-src 'self'
• Apply input validation at the reverse proxy or web server level to sanitize or reject requests containing script content
• Consider restricting access to RealtyScript to trusted networks until a patch is available
• Use HTTP-only and Secure flags on session cookies to limit the impact of potential session theft

# Example Apache configuration for CSP header
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:;"

# Example ModSecurity rule to block common XSS patterns
SecRule ARGS "@rx <script" "id:1001,phase:2,deny,status:403,msg:'XSS Attack Detected'"