CVE-2006-5883 in cPanel
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in cPanel 10 allow remote authenticated users to inject arbitrary web script or HTML via the (1) dir parameter in (a) seldir.html, and the (2) user and (3) dir parameters in (b) newuser.html.
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Analysis
by VulDB Data Team • 04/27/2026
The CVE-2006-5883 vulnerability represents a critical cross-site scripting flaw in cPanel version 10 that affects web application security through multiple attack vectors. This vulnerability resides within the administrative interface of cPanel, a widely used web hosting control panel that manages various server functions including user account creation and directory navigation. The flaw specifically targets the handling of user-supplied input parameters in two distinct HTML pages within the cPanel interface, creating opportunities for authenticated attackers to execute malicious scripts in the context of other users' browsers.
The technical implementation of this vulnerability involves three distinct parameter injection points that collectively enable XSS attacks. The first vector operates through the dir parameter in the seldir.html page, while the second and third vectors target the user and dir parameters respectively in the newuser.html page. These parameters are processed without proper input sanitization or output encoding, allowing attackers to inject malicious HTML content or JavaScript code that gets executed when other users view the affected pages. The vulnerability exists because cPanel fails to properly validate or escape user input before rendering it in the web interface, creating a persistent XSS condition that can be exploited by authenticated users with access to the cPanel interface.
The operational impact of CVE-2006-5883 extends beyond simple script injection, as it provides attackers with the ability to hijack user sessions, steal sensitive information, and potentially escalate privileges within the hosting environment. Since the vulnerability requires only authenticated access to cPanel, attackers who have obtained valid user credentials can leverage this flaw to compromise other users within the same hosting environment. The implications are particularly severe in shared hosting environments where multiple customers share the same server infrastructure, as successful exploitation could allow attackers to access other users' accounts, view sensitive data, or manipulate server configurations. This vulnerability directly maps to CWE-79, which defines cross-site scripting as a weakness where untrusted data is used to generate web content without proper validation or encoding, making it a classic example of insecure data handling in web applications.
The exploitation of this vulnerability aligns with several techniques documented in the MITRE ATT&CK framework, particularly under the 'Initial Access' and 'Persistence' phases of attack chains. Attackers can use this XSS vulnerability to establish a foothold within the hosting environment and potentially move laterally to compromise other systems. The vulnerability also demonstrates the importance of implementing proper input validation and output encoding as fundamental security controls, which are categorized under defensive measures in the ATT&CK framework. Organizations using cPanel 10 should prioritize immediate remediation through patch updates, while implementing additional security measures such as web application firewalls, regular security audits, and monitoring for suspicious user activities. The vulnerability serves as a critical reminder of the importance of secure coding practices in administrative interfaces where user input is processed and displayed, emphasizing the need for comprehensive security testing and validation of all user-supplied data before it is rendered in web contexts.