CVE-2026-105602 in Helix Ultimate Extension
Summary
by MITRE • 11/02/2026
Joomla Extension - joomshaper.com - Stored Cross-Site Scripting (XSS) in Mega Menu Badge Text in Helix Ultimate < 2.2.11.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified involves a stored cross-site scripting flaw within the Joomla extension developed by JoomShaper, specifically affecting the Helix Ultimate template framework prior to version 2.2.11. This security issue is located in the Mega Menu component, which allows site administrators and potentially other authorized users to configure complex navigation structures for websites built on this platform. The specific point of failure lies in the handling of badge text fields associated with menu items within the mega menu configuration interface. When a user inputs data into these fields, the system fails to adequately sanitize or encode special characters before storing them in the database and subsequently rendering them back to the browser during page loads. This lack of proper input validation allows an attacker who has access to the administrative backend or any role capable of editing menu items to inject malicious JavaScript code that persists on the server side rather than being executed only within a single session context typical of reflected XSS attacks.
From a technical perspective, this flaw represents a classic instance of improper neutralization of special elements used in an output web page, commonly categorized under CWE-79: Improper Neutralization of Input During Web Page Generation. The root cause stems from the application's failure to apply appropriate encoding strategies such as HTML entity encoding or context-aware escaping when processing user-supplied input for display purposes. Because the malicious payload is stored in the database associated with a specific menu item, it remains active until manually removed by an administrator. This persistence distinguishes it from transient vulnerabilities and significantly increases its potential impact window. The vulnerability exploits the trust relationship between the web application's backend and the frontend rendering engine, allowing client-side scripts to execute within the security context of the victim user who views the affected page.
The operational impact of this stored XSS vulnerability is severe, particularly in environments where multiple users interact with the website or where administrative privileges are shared among several individuals. An attacker can craft a payload that steals session cookies, thereby hijacking active sessions and gaining unauthorized access to sensitive areas of the Joomla administration panel. Beyond session theft, the malicious script could perform actions on behalf of the victim user without their knowledge, such as modifying site configurations, creating new administrative accounts, or defacing content. In cases where cross-site request forgery protections are weakly implemented elsewhere in the application, this vulnerability can serve as a vector for broader compromise. The persistence of the payload means that every visitor to the page containing the compromised menu item is potentially exposed, turning individual user interactions into widespread exploitation opportunities if the victim base includes privileged users or high-value targets.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. The primary and most effective solution is to upgrade the Helix Ultimate extension to version 2.2.11 or later, where the developers have implemented proper input sanitization and output encoding mechanisms for all user-controlled fields within the mega menu configuration interface. For organizations unable to patch immediately due to compatibility constraints with other extensions, a temporary workaround involves restricting access to the Joomla administrator backend through IP whitelisting or multi-factor authentication to prevent unauthorized users from injecting malicious payloads into menu items. Additionally, implementing a Content Security Policy header can help mitigate the impact of successful exploitation by restricting the sources from which scripts are allowed to execute, although this is not a substitute for fixing the underlying code flaw. Regular security audits and penetration testing focused on input validation across all user-facing forms within administrative interfaces are recommended to detect similar vulnerabilities before they can be exploited in production environments.
This vulnerability aligns with known attack patterns documented in industry frameworks such as MITRE ATT&CK, specifically relating to Initial Access techniques involving valid accounts and Execution techniques via browser-based scripting. The persistence mechanism places it firmly within the category of stored threats that require proactive monitoring rather than reactive detection alone. Security teams should prioritize patching this specific component given its central role in site navigation and high visibility on public-facing pages. Continuous integration pipelines for Joomla extensions should include automated static analysis tools configured to detect missing output encoding patterns, ensuring that future updates do not reintroduce similar weaknesses. By addressing the root cause through rigorous input validation and adhering to secure coding standards like OWASP Top Ten guidelines regarding XSS prevention, organizations can significantly reduce their attack surface and protect both administrative integrity and end-user security.