CVE-2026-60029 in Quix Page Builder Pro Plugin
Summary
by MITRE • 07/20/2026
The Joomla extension Quix Page Builder Pro is vulnerable to an authenticated stored XSS vulnerability. Authenticated builder users could break out of id/class fields that render for public users.
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Analysis
by VulDB Data Team • 07/20/2026
The vulnerability in Joomla extension Quix Page Builder Pro represents a critical authenticated stored cross-site scripting flaw that enables attackers with builder user privileges to inject malicious code into the system's rendering process. This issue specifically affects the handling of id and class attributes within the page builder interface, where input validation and sanitization mechanisms fail to properly escape or filter user-supplied data before it gets rendered for public-facing website visitors.
The technical execution of this vulnerability occurs when authenticated users with builder permissions manipulate the id and class fields in the Quix Page Builder interface. These fields are designed to accept CSS identifiers and class names that will be applied to HTML elements during frontend rendering. However, the extension fails to implement proper input sanitization or output encoding mechanisms, allowing malicious payloads to persist in the database and execute when the affected page is rendered for end users. This stored nature of the vulnerability means that once exploited, the malicious code remains active until manually removed from the system.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with a persistent vector for various malicious activities including session hijacking, credential theft, and redirection to malicious sites. When public users visit pages containing the stored XSS payload, their browsers execute the injected JavaScript code within the context of the vulnerable website, potentially compromising user sessions and enabling attackers to perform actions on behalf of legitimate users. The vulnerability affects all users who access the public-facing website, regardless of whether they are authenticated or not, making it particularly dangerous for content management systems that serve high-traffic audiences.
Security professionals should implement multiple layers of defense against this vulnerability including immediate patching of the Quix Page Builder Pro extension to address the input validation gaps. The remediation process must involve comprehensive sanitization of all user-supplied data in id and class fields, implementation of proper HTML escaping for output rendering, and validation of attribute values against allowed character sets. Organizations should also consider implementing web application firewalls with XSS detection capabilities and regular security scanning of their Joomla installations to identify similar vulnerabilities across other extensions. This vulnerability aligns with CWE-79 (Cross-site Scripting) and maps to ATT&CK techniques including T1566.001 (Phishing via Social Engineering) and T1059.007 (Command and Scripting Interpreter: PowerShell), as attackers can leverage the stored XSS for further compromise of user sessions and system access.
The broader implications of this vulnerability highlight the critical need for proper input validation and output encoding in web applications, particularly those handling user-generated content through rich text editors or page builder interfaces. Organizations implementing content management systems must ensure that all user inputs are properly sanitized regardless of their intended use within the application's rendering pipeline. This incident underscores the importance of security testing during software development phases and regular vulnerability assessments of third-party extensions that integrate deeply with core platform functionality, as these components often represent significant attack surfaces when proper security controls are not implemented.