CVE-2006-1835 in Calendarix Advanced
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in yearcal.php in Calendarix allows remote attackers to inject arbitrary web script or HTML via the ycyear parameter.
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Analysis
by VulDB Data Team • 08/11/2025
The vulnerability identified as CVE-2006-1835 represents a classic cross-site scripting flaw located within the yearcal.php component of the Calendarix web application. This issue specifically affects the ycyear parameter, which processes user input without adequate sanitization or validation mechanisms. The vulnerability falls under the broader category of CWE-79 Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that enables malicious actors to inject client-side scripts into web pages viewed by other users.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing script code and passes it through the ycyear parameter in the yearcal.php script. When the application processes this input and renders it within the web page context without proper encoding or filtering, the injected script executes in the victim's browser within the security context of the vulnerable application. This creates a persistent vector for malicious activities including session hijacking, data theft, defacement, and redirection to malicious sites. The vulnerability demonstrates poor input validation practices and highlights the critical importance of implementing proper output encoding mechanisms in web applications.
From an operational standpoint, this XSS vulnerability poses significant risks to organizations using Calendarix applications, particularly those handling sensitive data or user information. Attackers can leverage this flaw to steal user session cookies, potentially gaining unauthorized access to user accounts and administrative privileges. The impact extends beyond individual user compromise to potential data breaches and reputational damage. The vulnerability is particularly concerning because it affects a calendar application, which may be used by employees, customers, or partners, amplifying the potential attack surface and impact. According to ATT&CK framework, this represents a technique categorized under T1531 Lateral Tool Transfer and T1059 Command and Scripting Interpreter, where attackers can establish persistent access through malicious script injection.
The remediation approach for this vulnerability requires immediate implementation of input validation and output encoding measures. Developers should implement strict validation of the ycyear parameter to ensure it only accepts expected numeric values within defined ranges. Additionally, proper HTML encoding must be applied to all user-supplied input before rendering it in web pages to prevent script execution. The application should also implement Content Security Policy (CSP) headers to provide additional defense-in-depth against script injection attacks. Organizations should conduct comprehensive security testing including dynamic application security testing and manual code review to identify similar vulnerabilities throughout the application. This vulnerability underscores the necessity of following secure coding practices and implementing defense-in-depth strategies as outlined in OWASP Top Ten and NIST Cybersecurity Framework guidelines for web application security.