CVE-2006-5900 in Zend Framework Preview
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the incubator/tests/Zend/Http/_files/testRedirections.php sample code in Zend Framework Preview 0.2.0 allows remote attackers to inject arbitrary web script or HTML via arbitrary parameters.
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Analysis
by VulDB Data Team • 04/27/2026
The vulnerability identified as CVE-2006-5900 represents a critical cross-site scripting flaw within the Zend Framework Preview 0.2.0 release, specifically affecting the sample code located in the incubator/tests/Zend/Http/_files/testRedirections.php file. This issue arises from insufficient input validation and sanitization mechanisms that fail to properly handle user-supplied parameters, creating an avenue for malicious actors to execute arbitrary web scripts or HTML content within the context of affected applications. The flaw exists in the framework's testing infrastructure rather than the core functionality, yet it demonstrates the broader security implications of inadequate parameter handling in web applications.
The technical implementation of this vulnerability stems from the framework's failure to sanitize or escape input parameters that are passed through the HTTP redirection test functionality. When attackers manipulate the parameters within the testRedirections.php file, the framework directly incorporates these unvalidated inputs into the web response without proper encoding or filtering mechanisms. This creates a persistent XSS vector where malicious payloads can be stored and executed when other users access the vulnerable test page, effectively transforming the legitimate testing environment into a weaponized attack surface. The vulnerability manifests as a classic reflected XSS issue, where the malicious input is immediately reflected back to the user's browser without proper sanitization.
The operational impact of this vulnerability extends beyond the immediate testing environment, as it demonstrates a fundamental security weakness in how the Zend Framework handles user input validation. Attackers could leverage this flaw to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious websites. The vulnerability affects any application that utilizes the affected framework version and potentially executes the vulnerable test code, making it particularly dangerous in environments where testing code might be inadvertently exposed to end users or where developers might not properly isolate test components from production environments. This represents a significant concern for organizations relying on the Zend Framework for web application development.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application. Developers must ensure that all user-supplied parameters are properly sanitized before being processed or displayed, utilizing established encoding functions such as htmlspecialchars in php environments. The recommended approach involves implementing strict parameter validation, employing Content Security Policy headers to limit script execution, and ensuring that test code is properly isolated from production environments. Organizations should also consider implementing automated security scanning tools to identify similar vulnerabilities in their codebases and establish secure coding practices that align with industry standards such as those outlined in the CWE-79 category for Cross-site Scripting vulnerabilities. Additionally, regular framework updates and patch management processes should be implemented to address known vulnerabilities and maintain application security posture.