CVE-2026-76607 in Fabrik Extension
Summary
by MITRE • 08/22/2026
Joomla Extension - fabrikar.com - Missing ACL check in download element in Fabrik < 4.7.3 - ???.
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Analysis
by VulDB Data Team • 08/22/2026
The vulnerability identified in the Fabrik extension for Joomla, specifically affecting versions prior to 4.7.3, centers on a critical failure in Access Control List enforcement within the file download functionality. Fabrik is a widely utilized component that allows users to create complex forms and data-driven applications within the Joomla content management system. A core feature of such extensions is the ability for administrators or specific user groups to attach files to form records, which can then be downloaded by authorized individuals. The security flaw arises because the backend logic responsible for serving these downloadable assets does not adequately verify whether the requesting user possesses the necessary permissions to access the specific file being requested. This oversight represents a classic instance of Broken Access Control, categorized under CWE-284 in the Common Weakness Enumeration standards.
In a properly secured implementation, any request to retrieve a sensitive resource must be validated against the current session's identity and associated role-based permissions before the system grants access. In this specific case, an attacker who has authenticated into the Joomla site with even minimal privileges can manipulate parameters within the download URL or form submission data to target files belonging to other users or administrative records that should remain restricted. Because the application fails to perform a secondary authorization check at the point of file delivery, it relies implicitly on the assumption that only authorized forms are accessible via the frontend interface. However, since many Joomla sites allow public registration and login, an attacker with any valid account can exploit this gap. This flaw effectively bypasses the intended security boundaries established by the site administrators through ACL rules, leading to a significant breach of confidentiality for stored data.
The operational impact of this vulnerability is severe, particularly in environments where Fabrik is used to manage sensitive personal information, financial records, or proprietary business documents. Successful exploitation allows an attacker to download arbitrary files associated with any record in the database that has file attachments, provided they can guess or enumerate the relevant identifiers. This capability facilitates unauthorized data exfiltration, potentially exposing personally identifiable information (PII) protected under regulations such as GDPR or HIPAA, depending on the jurisdiction and industry context. Furthermore, if the uploaded files contain executable scripts or malicious payloads disguised as legitimate documents, this vulnerability could also serve as a vector for further attacks against other users who download these compromised assets. The lack of proper access verification undermines the integrity of the entire application's security model, rendering ACL configurations ineffective for file resources.
From an ATT&CK perspective, this vulnerability aligns with techniques related to Collection and Exfiltration over Application Protocol, specifically leveraging legitimate application functions to steal data without triggering typical intrusion detection alerts due to the use of valid credentials. The exploitation does not require privilege escalation or remote code execution but rather abuses existing functionality in a manner unintended by the developers. To mitigate this risk, site administrators must immediately update the Fabrik extension to version 4.7.3 or later, where the missing access control checks have been implemented and validated. Until an upgrade is performed, temporary mitigations include restricting public registration on the Joomla instance if feasible, implementing strict web application firewall rules that monitor for anomalous file download patterns, and auditing database records to ensure no sensitive data was exposed prior to patching. Regular security audits of custom extensions are essential to prevent similar logic flaws in future deployments.