CVE-2008-6515 in yappa-ng
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Fritz Berger yet another php photo album - next generation (yappa-ng) allows remote attackers to inject arbitrary web script or HTML via the query string to the default URI.
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Analysis
by VulDB Data Team • 12/21/2025
The CVE-2008-6515 vulnerability represents a critical cross-site scripting flaw in the yappa-ng php photo album application developed by Fritz Berger. This vulnerability exists within the application's input validation mechanisms, specifically in how it processes query string parameters passed to the default URI endpoint. The flaw enables remote attackers to execute malicious scripts in the context of other users' browsers, potentially leading to session hijacking, credential theft, or unauthorized actions within the application's security boundaries.
The technical nature of this vulnerability aligns with CWE-79, which describes improper neutralization of input during web page generation in web applications. The yappa-ng application fails to properly sanitize or encode user-supplied input from HTTP query parameters before incorporating them into dynamically generated web pages. When a user visits a maliciously crafted URL containing script code within the query string, the application processes this input without adequate validation, allowing the injected malicious code to execute in the victim's browser environment. This type of vulnerability is particularly dangerous because it can be exploited through social engineering attacks where users are tricked into clicking malicious links.
The operational impact of this vulnerability extends beyond simple script injection, as it can be leveraged for more sophisticated attacks within the context of web application security. Attackers can craft payloads that steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users. The vulnerability affects the application's authentication and authorization mechanisms, potentially allowing unauthorized access to user accounts and administrative functions. This represents a significant threat to user privacy and application integrity, particularly in environments where the photo album serves as a platform for sharing personal or sensitive content.
Mitigation strategies for CVE-2008-6515 should focus on implementing proper input validation and output encoding techniques. The application should sanitize all user-supplied input through whitelisting mechanisms or proper HTML entity encoding before rendering content. Security headers such as Content Security Policy should be implemented to prevent execution of unauthorized scripts. Additionally, the application should enforce strict input validation on query parameters and implement proper error handling to prevent information disclosure. Organizations should also consider implementing web application firewalls and regular security assessments to detect and prevent similar vulnerabilities in other components of their web infrastructure. The vulnerability demonstrates the critical importance of following secure coding practices as outlined in the OWASP Top Ten and the ATT&CK framework's web application attack patterns, particularly in preventing client-side code injection vulnerabilities that can compromise entire user sessions and data integrity.