CVE-2002-1702 in Php Classifieds
Summary
by MITRE
Cross-site scripting vulnerability (XSS) in DeltaScripts PHP Classifieds 6.0.5 allows remote attackers to execute arbitrary script as other users via the URL parameter.
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Analysis
by VulDB Data Team • 09/02/2025
The vulnerability identified as CVE-2002-1702 represents a critical cross-site scripting flaw within DeltaScripts PHP Classifieds version 6.0.5, classified under CWE-79 Improper Neutralization of Input During Web Page Generation. This weakness arises from insufficient validation and sanitization of user-supplied input within the application's URL parameter handling mechanism. The vulnerability specifically affects the web application's ability to properly escape and validate data before rendering it in web pages, creating an exploitable condition that enables malicious actors to inject and execute arbitrary client-side scripts within the context of other users' browsers.
The technical exploitation of this vulnerability occurs when remote attackers manipulate the URL parameter to inject malicious script code that gets executed in the victim's browser session. This occurs because the application fails to implement proper input validation and output encoding mechanisms, allowing attackers to bypass security controls designed to prevent such injections. The flaw specifically targets the application's parameter processing pipeline where user input is directly incorporated into dynamic web content without adequate sanitization. Attackers can craft malicious URLs containing script payloads that, when visited by unsuspecting users, execute in their browser context with the privileges of the authenticated user, potentially leading to session hijacking, credential theft, or other malicious activities.
The operational impact of this vulnerability extends beyond simple script execution, as it creates a persistent security risk that can be leveraged for more sophisticated attacks within the application's user base. When successful, the vulnerability enables attackers to impersonate legitimate users, access sensitive data, modify content, or redirect users to malicious websites. The attack surface is particularly concerning given that the vulnerability affects a classifieds application where users may have varying levels of access and data sensitivity. The flaw can be exploited through various vectors including phishing campaigns, social engineering, or by simply sharing malicious links within the application's user community, making it particularly dangerous for applications with active user populations.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms across all user-supplied data entry points. The recommended approach involves applying strict parameter validation to ensure that URL parameters contain only expected data types and formats, combined with proper HTML entity encoding of all dynamic content before rendering. Security measures should include implementing Content Security Policy headers to limit script execution capabilities, establishing proper input sanitization routines, and conducting regular security audits of all web application components. Organizations should also consider implementing web application firewalls and monitoring systems to detect and prevent exploitation attempts, while ensuring that all application components are regularly updated to address known vulnerabilities. This vulnerability aligns with ATT&CK technique T1566.001 for Phishing and T1059.007 for Command and Scripting Interpreter, emphasizing the need for layered defensive strategies. The remediation process must include thorough code reviews, implementation of secure coding practices, and comprehensive testing to prevent similar vulnerabilities from emerging in future application versions.