CVE-2006-5717 in Zend Google Data Client Library Preview
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Zend Google Data Client Library (ZendGData) Preview 0.2.0 allow remote attackers to inject arbitrary web script or HTML via unspecified parameters in (1) basedemo.php and (2) calenderdemo.php in samples/, and other unspecified files.
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Analysis
by VulDB Data Team • 04/26/2026
The CVE-2006-5717 vulnerability represents a critical cross-site scripting weakness discovered in the Zend Google Data Client Library version 0.2.0 preview release. This vulnerability affects the library's sample demonstration files and exposes applications using the library to potential malicious code injection attacks. The flaw specifically impacts the basedemo.php and calenderdemo.php files located within the samples directory, though the vulnerability extends to other unspecified files within the library's codebase. The vulnerability stems from insufficient input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before incorporating it into web responses.
The technical implementation of this vulnerability occurs when user input is directly reflected in the application's output without proper sanitization or encoding. Attackers can exploit this weakness by crafting malicious payloads that contain script tags or other HTML elements designed to execute within the context of a victim's browser session. The vulnerability operates under CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is incorporated into web pages without proper validation or encoding. When the vulnerable library processes user input through the affected demonstration scripts, the malicious code becomes embedded in the generated HTML output and executes when other users access the affected pages.
The operational impact of CVE-2006-5717 extends beyond simple script execution, potentially enabling attackers to perform session hijacking, steal sensitive information, redirect users to malicious sites, or perform actions on behalf of authenticated users. The vulnerability affects web applications that utilize the Zend Google Data Client Library for integrating Google Data services, particularly those implementing the sample demonstration files as part of their development or testing environments. Given that these are preview releases, the vulnerability represents a significant security risk for early adopters who may have deployed these libraries in production environments without proper security assessment. The attack surface is broadened by the fact that the vulnerability affects multiple files within the samples directory, indicating a systemic issue in the library's input handling rather than isolated code flaws.
Organizations implementing the affected Zend Google Data Client Library should immediately apply patches or updates provided by Zend Technologies, as the vulnerability affects core functionality within the library's demonstration components. The recommended mitigations include implementing proper input validation and output encoding mechanisms that align with OWASP XSS prevention guidelines and the ATT&CK framework's mitigation strategies for web application attacks. Security teams should conduct comprehensive code reviews to identify similar patterns in their own applications that might be using the vulnerable library components. Additionally, network monitoring should be enhanced to detect suspicious patterns in web traffic that might indicate exploitation attempts, particularly focusing on unusual script tags or HTML injection patterns in HTTP requests. The vulnerability underscores the importance of security testing during early development phases and the necessity of proper security controls in all application components, especially those handling user input.