CVE-2009-4686 in AdQuick
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in account.php in phplemon AdQuick 2.2.1 allows remote attackers to inject arbitrary web script or HTML via the red_url parameter.
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Analysis
by VulDB Data Team • 05/02/2026
The CVE-2009-4686 vulnerability represents a classic cross-site scripting flaw in the phplemon AdQuick 2.2.1 web application, specifically within the account.php script. This vulnerability exposes the application to malicious injection attacks that can compromise user sessions and data integrity. The flaw manifests through the red_url parameter which fails to properly validate or sanitize user input before processing, creating an avenue for attackers to execute arbitrary web scripts or HTML code within the context of other users' browsers. The vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a critical security weakness in web applications.
The technical exploitation of this vulnerability occurs when a remote attacker crafts malicious input containing script code and passes it through the red_url parameter in the account.php script. When the application processes this unvalidated input and subsequently displays it without proper output encoding or sanitization, the injected scripts execute in the victim's browser within the legitimate session context of the vulnerable application. This creates a persistent threat where attackers can steal session cookies, deface web pages, redirect users to malicious sites, or perform actions on behalf of authenticated users. The vulnerability specifically targets the parameter validation mechanism, highlighting weak input handling practices that violate secure coding principles.
The operational impact of this vulnerability extends beyond simple script injection to encompass potential session hijacking, data theft, and service disruption. Attackers can leverage this weakness to establish persistent access to user accounts, modify application behavior, or redirect traffic to phishing sites that can harvest sensitive information from unsuspecting users. The vulnerability affects all users of the phplemon AdQuick 2.2.1 platform who interact with the account management functionality, creating widespread exposure across the user base. This type of vulnerability can be particularly dangerous in advertising platforms where users may be exposed to malicious scripts while managing their accounts, potentially compromising the entire advertising ecosystem.
Mitigation strategies for CVE-2009-4686 should focus on implementing robust input validation and output encoding mechanisms throughout the application. The primary defense involves sanitizing all user-supplied input through proper validation routines that reject or escape potentially dangerous characters and script tags. Additionally, implementing proper output encoding when displaying user data prevents script execution even if malicious input slips through validation. Security measures should include input length restrictions, character set validation, and the use of secure coding practices that align with OWASP Top Ten recommendations. The vulnerability also underscores the importance of regular security assessments and code reviews to identify and remediate similar input validation flaws. Organizations should consider implementing Content Security Policy headers to add an additional layer of protection against script injection attacks, while also ensuring that all web applications are regularly updated to address known vulnerabilities and maintain compliance with industry security standards such as those defined in the ATT&CK framework for web application security.