CVE-2015-20116 in RealtyScript
Summary
by MITRE • 03/16/2026
Next Click Ventures RealtyScript 4.0.2 fails to properly sanitize CSV file uploads, allowing attackers to inject malicious scripts through filename parameters in multipart form data. Attackers can upload files with XSS payloads in the filename field to execute arbitrary JavaScript in users' browsers when the file is processed or displayed.
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Analysis
by VulDB Data Team • 03/20/2026
The vulnerability identified as CVE-2015-20116 affects Next Click Ventures RealtyScript version 4.0.2, representing a critical cross-site scripting flaw that stems from inadequate input validation during CSV file upload processing. This weakness resides in the application's failure to properly sanitize filename parameters within multipart form data, creating an avenue for malicious actors to inject persistent script code into the system. The vulnerability specifically targets the filename field in CSV uploads, where attackers can manipulate the parameter to include malicious JavaScript payloads that execute when files are processed or displayed within the application interface.
The technical implementation of this vulnerability aligns with CWE-79, which describes cross-site scripting vulnerabilities arising from improper sanitization of user-supplied data. When the RealtyScript application processes uploaded CSV files, it fails to adequately filter or encode filename parameters, allowing attackers to inject malicious code that persists within the application's file metadata. This flaw operates within the context of web application security where user input validation is insufficient, creating a persistent threat vector that can be exploited through various attack vectors including file upload mechanisms. The vulnerability demonstrates a classic case of inadequate output encoding and input sanitization, where the application treats user-provided filenames as trusted input without proper security validation.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to perform session hijacking, steal user credentials, redirect victims to malicious sites, and potentially escalate privileges within the application environment. When users view or process files that contain malicious payloads in their filenames, the injected JavaScript executes in the context of their browser sessions, potentially compromising the entire user session and enabling further attacks. This vulnerability can be particularly dangerous in enterprise environments where real estate applications may handle sensitive property data, user information, and financial records. The attack surface is broadened by the fact that the vulnerability can be exploited through legitimate file upload functionality, making detection more challenging for security monitoring systems.
Mitigation strategies for CVE-2015-20116 should focus on implementing robust input validation and output encoding mechanisms within the application's file upload processing pipeline. Organizations should implement strict filename sanitization that removes or encodes potentially dangerous characters and patterns from uploaded filenames, particularly those that could be interpreted as HTML or JavaScript. The application should enforce a whitelist approach for acceptable filename characters and implement proper encoding of all user-supplied data before it is displayed or processed within the application interface. Additionally, security measures should include implementing Content Security Policy headers to prevent execution of unauthorized scripts, and conducting regular security testing including dynamic application security testing to identify similar vulnerabilities in file handling components. The remediation efforts should align with ATT&CK framework techniques related to credential access and execution through web application vulnerabilities, ensuring comprehensive protection against similar attack patterns.