CVE-2009-4782 in Theeta CMS
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Theeta CMS, possibly 0.01, allow remote attackers to inject arbitrary web script or HTML via the (1) start, (2) forum, and (3) cat parameters to community/thread.php; (4) start and (5) cat parameters to community/forum.php; and (6) start parameter to blog/index.php.
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Analysis
by VulDB Data Team • 09/09/2025
The CVE-2009-4782 vulnerability represents a critical cross-site scripting flaw in Theeta CMS version 0.01, exposing multiple attack vectors that enable remote code execution through malicious web script injection. This vulnerability stems from inadequate input validation and sanitization mechanisms within the content management system's core components. The flaw specifically affects three distinct PHP scripts including community/thread.php, community/forum.php, and blog/index.php, each handling user-supplied parameters without proper security controls. Attackers can exploit these entry points by manipulating the start, forum, cat, and other parameters to inject malicious payloads that persist in the application's response handling.
The technical implementation of this vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications. The flaw occurs when user input flows directly into HTML output without proper encoding or sanitization, creating opportunities for attackers to execute malicious scripts in the context of other users' browsers. The affected parameters in community/thread.php accept the start, forum, and cat parameters, while community/forum.php handles start and cat parameters, and blog/index.php processes only the start parameter. These vulnerabilities demonstrate a fundamental weakness in the application's data handling architecture, where input validation occurs too late in the processing pipeline or not at all.
The operational impact of this vulnerability extends beyond simple script injection, potentially enabling attackers to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious sites, or even escalate privileges within the compromised system. The persistent nature of these XSS vulnerabilities means that once injected, malicious scripts can execute against any user who accesses the affected pages, creating a widespread attack surface. The vulnerability's presence in core community and blog functionality suggests that attackers could compromise not only user sessions but also potentially gain access to administrative functions through session hijacking or credential theft. This makes the vulnerability particularly dangerous in multi-user environments where different privilege levels exist.
Mitigation strategies should focus on implementing comprehensive input validation, output encoding, and proper parameter sanitization across all affected scripts. The recommended approach includes implementing strict input validation that rejects or sanitizes potentially malicious characters, employing output encoding mechanisms that prevent script execution in HTML contexts, and establishing proper parameter handling procedures. Organizations should also consider implementing Content Security Policy headers to limit script execution sources, utilizing web application firewalls to detect and block malicious payloads, and conducting regular security audits of all user input handling mechanisms. The vulnerability underscores the importance of following secure coding practices as outlined in the OWASP Top Ten and emphasizes the need for continuous security testing throughout the software development lifecycle. Additionally, administrators should ensure that Theeta CMS is updated to the latest version where these vulnerabilities have been patched, and implement proper access controls to limit the potential impact of any successful exploitation attempts.