CVE-2005-2326 in Clever Copy
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Clever Copy 2.0 and 2.0a allows remote attackers to inject arbitrary web script or HTML via the yr parameter to calendar.php.
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Analysis
by VulDB Data Team • 05/25/2025
The vulnerability identified as CVE-2005-2326 represents a critical cross-site scripting flaw in Clever Copy content management systems version 2.0 and 2.0a. This security weakness resides within the calendar.php script where user input is not properly sanitized or validated before being processed and displayed. The specific parameter affected is named 'yr', which when manipulated by an attacker can execute malicious scripts in the context of other users' browsers who visit the compromised calendar page. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting conditions where untrusted data is improperly incorporated into web pages without proper validation or escaping mechanisms.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious payload containing HTML or JavaScript code and injects it through the 'yr' parameter in the calendar.php URL. When the vulnerable application processes this input and displays it without adequate sanitization, the injected code executes in the browser of any user who accesses the affected calendar page. This allows attackers to perform various malicious activities including session hijacking, credential theft, redirection to malicious websites, or defacement of the compromised website. The vulnerability demonstrates a classic input validation failure where the application fails to implement proper output encoding or filtering for user-supplied data.
The operational impact of this vulnerability extends beyond simple data theft or website defacement. Attackers can leverage this XSS flaw to establish persistent access patterns against authenticated users, potentially compromising entire user sessions and gaining unauthorized administrative privileges. The attack surface is particularly concerning as calendar functionality is often used for scheduling sensitive business meetings, sharing confidential information, or managing user access controls. When combined with other vulnerabilities or attack vectors, this XSS weakness can serve as a foothold for more sophisticated attacks such as those targeting the broader application ecosystem or network infrastructure. Organizations using Clever Copy 2.0 or 2.0a systems face significant risk of unauthorized access and data compromise through this vulnerability.
Mitigation strategies for CVE-2005-2326 should focus on immediate input validation and output encoding measures. The most effective approach involves implementing strict parameter validation for the 'yr' parameter in calendar.php, ensuring that only expected numeric values are accepted and that all user input undergoes proper HTML entity encoding before display. Organizations should also implement proper content security policies to prevent execution of unauthorized scripts and consider deploying web application firewalls to detect and block malicious payloads. According to ATT&CK framework category T1190, this vulnerability represents a technique for gaining initial access through web application attacks, making it essential for security teams to address this flaw promptly through patching, input sanitization, and comprehensive application security reviews. The remediation process should include thorough code review of the calendar.php script to identify and fix all similar input validation gaps that may exist in the application's codebase.