CVE-2006-5774 in Hyper NIKKI System
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Hyper NIKKI System before 2.19.9 allows remote attackers to inject arbitrary web script or HTML via unknown vectors.
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Analysis
by VulDB Data Team • 04/26/2026
The CVE-2006-5774 vulnerability represents a critical cross-site scripting flaw discovered in the Hyper NIKKI System version 2.19.8 and earlier. This vulnerability falls under the CWE-79 category, which specifically addresses cross-site scripting attacks where malicious scripts are injected into web applications. The affected system's failure to properly sanitize user input creates an exploitable condition that enables remote attackers to execute arbitrary web scripts or HTML code within the context of other users' browsers. The vulnerability's classification as a remote code execution vector means that attackers can exploit this flaw without requiring physical access to the target system or user authentication.
The technical nature of this XSS vulnerability stems from inadequate input validation and output encoding mechanisms within the Hyper NIKKI System's web interface. Attackers can leverage this weakness by crafting malicious payloads that are then executed when other users view affected pages or interact with the application. The unspecified attack vectors suggest that multiple entry points within the system could be compromised, potentially including form fields, URL parameters, or other user-controllable data inputs. This broad attack surface increases the likelihood of successful exploitation and makes the vulnerability particularly dangerous in environments where user-generated content is prevalent.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to perform session hijacking, steal sensitive user credentials, redirect users to malicious websites, or even escalate privileges within the application. When users browse pages containing malicious scripts, their browsers execute the injected code, potentially leading to data breaches, unauthorized access to user accounts, or complete system compromise depending on the application's permissions and data sensitivity. The vulnerability's remote nature means that attackers can exploit it from anywhere on the internet, making it particularly challenging to defend against and monitor.
Organizations affected by this vulnerability should implement immediate mitigations including input validation, output encoding, and the implementation of Content Security Policies to prevent unauthorized script execution. The recommended solution involves upgrading to Hyper NIKKI System version 2.19.9 or later, which includes proper sanitization mechanisms. Additionally, implementing web application firewalls, conducting regular security assessments, and establishing proper input validation procedures can help prevent similar vulnerabilities from occurring in the future. This case highlights the critical importance of proper security practices in web application development and the necessity of regular security updates to protect against known vulnerabilities. The ATT&CK framework categorizes this vulnerability under T1059.008 for Scripting and T1566.001 for Spearphishing Attachment, demonstrating how such vulnerabilities can serve as initial access vectors for more sophisticated attacks.