CVE-2014-1899 in Netscaler Gateway
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Citrix NetScaler Gateway (formerly Citrix Access Gateway Enterprise Edition) 9.x before 9.3.66.5 and 10.x before 10.1.123.9 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 05/12/2026
The CVE-2014-1899 vulnerability represents a critical cross-site scripting flaw within Citrix NetScaler Gateway implementations across multiple versions. This vulnerability affects Citrix Access Gateway Enterprise Edition and NetScaler Gateway platforms running versions 9.x prior to 9.3.66.5 and 10.x prior to 10.1.123.9. The flaw enables remote attackers to execute malicious web scripts or HTML code within the context of affected systems, potentially compromising user sessions and data integrity. The vulnerability's impact extends across enterprise network access solutions where Citrix NetScaler Gateway serves as a critical component for secure remote access to corporate resources.
The technical nature of this XSS vulnerability stems from insufficient input validation and output encoding mechanisms within the Citrix NetScaler Gateway web interface. Attackers can exploit this weakness through unspecified vectors that likely involve manipulating parameters within HTTP requests or form submissions processed by the gateway's web administration interface. The vulnerability falls under the Common Weakness Enumeration category CWE-79, which specifically addresses Cross-site Scripting flaws in web applications. This classification indicates that the vulnerability arises from improper handling of user-supplied data that should be treated as untrusted and properly sanitized before being rendered in web contexts.
Operational impact of CVE-2014-1899 extends beyond simple script injection, as it provides attackers with potential access to sensitive corporate networks through session hijacking and credential theft. The vulnerability enables attackers to execute malicious scripts in the context of authenticated users, potentially allowing them to access internal network resources, steal session cookies, or perform unauthorized administrative actions. This threat aligns with ATT&CK technique T1566, which covers the use of malicious web content to compromise systems, and T1071.004, which involves application layer protocol usage for command and control communications. Organizations relying on Citrix NetScaler Gateway for remote access face significant risk of unauthorized access to their network infrastructure, particularly when users access the gateway's administrative interface from potentially compromised endpoints.
Mitigation strategies for CVE-2014-1899 require immediate implementation of security patches provided by Citrix, specifically upgrading to versions 9.3.66.5 or later for 9.x releases and 10.1.123.9 or later for 10.x releases. Organizations should also implement additional defensive measures including web application firewalls to monitor and filter malicious requests, enhanced input validation on all user-supplied data, and regular security assessments of the gateway's web interface. Network segmentation and least privilege access controls can help limit the potential damage from successful exploitation, while user education regarding suspicious web content and secure browsing practices provides additional layers of protection. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches for enterprise network infrastructure components, as outdated systems represent significant attack vectors for sophisticated threat actors.