CVE-2006-5293 in Noahs Classifieds
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.php in PhpOutsourcing Noah's Classifieds 1.3 and earlier allows remote attackers to inject arbitrary web script or HTML via the frommethod parameter.
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Analysis
by VulDB Data Team • 04/24/2026
The vulnerability identified as CVE-2006-5293 represents a classic cross-site scripting flaw affecting PhpOutsourcing Noah s Classifieds version 1.3 and earlier systems. This security weakness resides within the index.php script and specifically targets the frommethod parameter, creating an avenue for malicious actors to execute unauthorized web scripts or HTML content within the context of affected user sessions. The vulnerability demonstrates a critical failure in input validation and output encoding practices that are fundamental to web application security. According to the CWE classification system, this corresponds to CWE-79 which defines improper neutralization of input during web page generation, making it a direct descendant of the well-known OWASP Top Ten vulnerability category.
The technical implementation of this XSS vulnerability occurs when the application fails to properly sanitize or escape user-supplied input from the frommethod parameter before incorporating it into dynamically generated web pages. Attackers can exploit this by crafting malicious payloads that, when submitted through the vulnerable parameter, get executed in the browsers of other users who subsequently view the affected pages. This creates a persistent threat vector where malicious scripts can access session cookies, redirect users to phishing sites, or perform actions on behalf of authenticated users. The vulnerability operates at the application layer and requires no special privileges to exploit, making it particularly dangerous in multi-user environments where user interactions are common.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it enables sophisticated attack chains that can compromise entire user sessions and potentially lead to privilege escalation. An attacker could leverage this vulnerability to steal session tokens, modify user preferences, or even gain administrative access if the application architecture allows for such escalation paths. The attack surface is particularly concerning in classifieds systems where users frequently submit content and interact with third-party data, creating multiple opportunities for exploitation. This vulnerability directly maps to several ATT&CK techniques including T1531 for use of stolen credentials and T1059 for command and scripting interpreter execution, demonstrating how a single XSS flaw can enable broader attack methodologies.
Mitigation strategies for CVE-2006-5293 must focus on implementing robust input validation and output encoding mechanisms throughout the application stack. The primary defense involves sanitizing all user-provided input, particularly parameters like frommethod, through proper escaping techniques before rendering them in HTML contexts. Organizations should implement Content Security Policy headers to limit script execution and employ proper input validation libraries that can detect and neutralize malicious payloads. Additionally, upgrading to patched versions of PhpOutsourcing Noah s Classifieds is essential, as this vulnerability represents a known weakness that has been addressed in subsequent releases. Regular security testing including automated scanning and manual penetration testing should be conducted to identify similar vulnerabilities in other application components, as this flaw demonstrates the importance of comprehensive security practices rather than isolated fixes. The vulnerability also underscores the necessity of following secure coding practices and adhering to web application security standards such as those defined by OWASP to prevent similar issues from arising in future development cycles.