CVE-2008-6306 in Classifieds Script
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in signinform.php in Softbiz Classifieds Script allows remote attackers to inject arbitrary web script or HTML via the msg parameter. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 10/21/2025
The vulnerability identified as CVE-2008-6306 represents a classic cross-site scripting flaw within the Softbiz Classifieds Script application, specifically affecting the signinform.php component. This type of 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 allows attackers to inject malicious scripts into web pages viewed by other users. The vulnerability manifests when the application fails to properly sanitize or escape user input before incorporating it into dynamic web content, creating an opening for malicious code execution.
The technical exploitation of this vulnerability occurs through the msg parameter within the signinform.php script, where remote attackers can submit malicious payloads that get reflected back to users without proper input validation or output encoding. This reflects a common pattern of reflected XSS vulnerabilities where the malicious input is immediately processed and returned to the victim's browser without adequate sanitization measures. The vulnerability's classification aligns with ATT&CK technique T1059.001 - Command and Scripting Interpreter: PowerShell, as it enables attackers to execute arbitrary web-based commands through browser-based attacks. The attack vector requires minimal privileges and can be executed through simple web requests, making it particularly dangerous in environments where users trust the application's interface.
The operational impact of this vulnerability extends beyond simple script injection, as it can potentially enable attackers to steal user sessions, redirect victims to malicious sites, or perform actions on behalf of authenticated users. The weakness creates a persistent threat vector that can be exploited across multiple user sessions, particularly in classifieds platforms where users frequently interact with forms and submission interfaces. This vulnerability demonstrates the critical importance of input validation and output encoding in web applications, as the lack of proper sanitization allows attackers to bypass security controls that would otherwise prevent malicious code execution. The vulnerability's presence in a classifieds script is particularly concerning given the sensitive nature of user data and the potential for session hijacking attacks.
Mitigation strategies for this vulnerability must focus on implementing comprehensive input validation and output encoding mechanisms throughout the application. The recommended approach includes sanitizing all user-supplied input through proper encoding techniques such as HTML entity encoding before rendering content, implementing Content Security Policy headers to restrict script execution, and utilizing parameterized queries or input validation libraries to prevent malicious payloads from being processed. Organizations should also consider implementing web application firewalls to detect and block suspicious requests, while conducting regular security assessments to identify similar vulnerabilities in other application components. The remediation process should follow security best practices outlined in OWASP Top 10 and NIST guidelines, ensuring that all user inputs are properly validated and that output encoding is consistently applied across all dynamic content generation points. Additionally, regular security training for development teams on secure coding practices is essential to prevent similar vulnerabilities from being introduced in future application versions.