CVE-2012-3952 in PHPList
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in admin/index.php in phpList before 2.10.19 allows remote attackers to inject arbitrary web script or HTML via the unconfirmed parameter to the user page.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 03/12/2025
The CVE-2012-3952 vulnerability represents a critical cross-site scripting flaw in the phpList newsletter management system that affected versions prior to 2.10.19. This vulnerability resides within the administrative interface of the application, specifically in the admin/index.php file where user management functionality is handled. The flaw manifests when the application fails to properly sanitize user input passed through the unconfirmed parameter, creating an exploitable vector for malicious actors to inject arbitrary web scripts or HTML content into the application's administrative pages.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the phpList codebase. When administrators navigate to the user management section of the application, the unconfirmed parameter is processed without proper sanitization, allowing attackers to craft malicious payloads that persist in the application's user interface. This creates a persistent XSS condition where any administrator who views the affected page becomes vulnerable to script execution, potentially enabling session hijacking, credential theft, or further exploitation of the compromised administrative interface.
From an operational perspective, this vulnerability poses significant risk to organizations relying on phpList for email marketing campaigns and user management. Attackers exploiting this flaw can gain unauthorized access to administrative functions, modify user lists, send malicious emails, or establish persistent backdoors within the system. The impact extends beyond simple script injection as it compromises the integrity of the administrative interface, potentially leading to complete system compromise. The vulnerability aligns with CWE-79, which specifically addresses Cross-site Scripting flaws in web applications, and represents a classic example of how insufficient input validation can create persistent security weaknesses.
The exploitation of this vulnerability requires minimal technical skill and can be accomplished through standard web application attack techniques. Attackers need only craft a malicious URL containing the XSS payload and deliver it to an administrator who visits the user management page. This makes the vulnerability particularly dangerous as it can be exploited through social engineering, phishing campaigns, or by compromising other system components that might interact with the phpList interface. Organizations using affected versions should immediately implement mitigations including input validation, output encoding, and access controls. The recommended remediation involves upgrading to phpList version 2.10.19 or later, which includes proper parameter sanitization and input validation mechanisms. Additionally, implementing Content Security Policy headers and regular security audits can help reduce the attack surface and prevent similar vulnerabilities from being exploited in other parts of the application.