CVE-2006-6523 in cPanel
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in mail/manage.html in BoxTrapper in cPanel 11 allows remote attackers to inject arbitrary web script or HTML via the account parameter.
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Analysis
by VulDB Data Team • 09/16/2025
The vulnerability identified as CVE-2006-6523 represents a critical cross-site scripting flaw within the BoxTrapper email management component of cPanel version 11. This security weakness resides in the mail/manage.html file and specifically targets the account parameter handling mechanism. The flaw enables remote attackers to execute malicious web scripts or HTML code within the context of authenticated user sessions, potentially compromising the security of email accounts managed through the cPanel interface. The vulnerability stems from inadequate input validation and output encoding practices within the web application's parameter processing logic.
The technical exploitation of this XSS vulnerability occurs when an attacker crafts a malicious URL containing script code within the account parameter of the mail/manage.html endpoint. When an authenticated user clicks on such a crafted link or when the malicious input is processed by the application, the injected script executes in the victim's browser context. This allows attackers to perform actions such as stealing session cookies, redirecting users to malicious sites, defacing web interfaces, or executing unauthorized operations within the email management system. The vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws in web applications. The attack vector is particularly concerning as it operates through the legitimate email management interface, making it difficult for users to distinguish between legitimate and malicious interactions.
The operational impact of this vulnerability extends beyond simple script injection, as it can lead to complete compromise of email account security and potentially broader system access. An attacker who successfully exploits this vulnerability can manipulate email configurations, access sensitive email data, or use the compromised session to perform unauthorized administrative actions within the cPanel environment. The attack aligns with ATT&CK technique T1566 which covers social engineering tactics including the use of malicious links to execute code on target systems. This vulnerability particularly affects organizations relying on cPanel for email management, as it undermines the trust model between users and the email administration interface, potentially leading to data breaches, unauthorized access to email communications, and disruption of email services.
Mitigation strategies for this vulnerability should include immediate patching of cPanel installations to version 11.15.0.22 or later, which contains the necessary security fixes. Organizations should also implement input validation measures at the application level, ensuring that all user-supplied parameters are properly sanitized and encoded before processing. Web application firewalls can provide additional protection layers by detecting and blocking suspicious parameter values. Regular security audits of web applications should include testing for XSS vulnerabilities, particularly in input handling components. The remediation process should also involve user education about the dangers of clicking suspicious links and the importance of maintaining updated software versions. Security monitoring should be enhanced to detect unusual patterns in email management activities that might indicate exploitation attempts. Additionally, implementing content security policies can provide defense-in-depth measures that prevent execution of unauthorized scripts even if the primary vulnerability is not fully patched.