CVE-2026-76598 in Fabrik Extension
Summary
by MITRE • 08/22/2026
Joomla Extension - fabrikar.com - Unauthenticated arbitrary directory listing via onAjax_getFolders in Fabrik < 4.7.2 - The onAjax_getFolders method of the elements model allows arbitrary directory listings.
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Analysis
by VulDB Data Team • 08/22/2026
The vulnerability identified in Joomla extensions hosted at fabrikar.com, specifically within versions of Fabrik prior to 4.7.2, represents a critical security flaw rooted in improper access control mechanisms for server-side file system operations. The core technical issue resides in the onAjax_getFolders method belonging to the elements model component of the application. This function is designed to retrieve directory structures via asynchronous JavaScript and XML requests, typically intended for user interface enhancements such as dynamic form fields or media managers. However, due to insufficient validation of input parameters and a lack of proper authentication checks before executing file system commands, an unauthenticated attacker can exploit this endpoint to enumerate directories on the underlying server. This flaw allows external actors to bypass standard Joomla access controls that would normally restrict sensitive administrative functions to logged-in users with appropriate privileges.
From a technical perspective, the vulnerability stems from the application's failure to sanitize or validate the path parameters passed to the directory listing function before execution. When an attacker sends a crafted HTTP request targeting this specific Ajax endpoint without providing valid session tokens or authentication credentials, the server processes the request and returns the contents of directories accessible by the web server process user. This behavior effectively exposes the internal file structure of the Joomla installation, including configuration files, database connection details if located in readable paths, backup archives, and other potentially sensitive data stored within public-facing directories that might not be directly linked from the front end but are still reachable via relative path traversal or direct endpoint access depending on server configuration.
The operational impact of this vulnerability is significant as it serves as a powerful reconnaissance tool for attackers seeking to map out the target environment. By obtaining an accurate directory listing, threat actors can identify backup files containing database dumps, locate administrative login pages that might be hidden from casual observation, discover installed plugins or modules with known vulnerabilities, and potentially find configuration files like configuration.php which often contain plaintext database credentials. This information gathering phase is critical for subsequent attack vectors such as credential stuffing, targeted exploitation of other components, or direct file inclusion attacks if combined with other flaws. The ability to perform this enumeration without authentication lowers the barrier to entry significantly, allowing automated scanning tools and less sophisticated attackers to compromise the integrity and confidentiality of the web application environment efficiently.
This vulnerability aligns closely with Common Weakness Enumeration (CWE) categories such as CWE-200: Exposure of Sensitive Information to an Unauthorized Actor and CWE-538: Insertion of Sensitive Information into Externally-Accessible File or Directory. In terms of the MITRE ATT&CK framework, this flaw facilitates the Reconnaissance tactic, specifically under techniques related to Gathering Victim Machine Information via Local Network Discovery or Web Scraping depending on how the directory listing is utilized by subsequent attack stages. It also touches upon Improper Access Control (CWE-284) as it represents a failure in enforcing authentication requirements for sensitive operations.
To mitigate this risk, immediate action must be taken to upgrade the Fabrik extension to version 4.7.2 or later where these access control checks have been implemented and validated by the developers. Until an update is applied, administrators should consider implementing web application firewall rules that block requests targeting the specific onAjax_getFolders endpoint when authentication tokens are missing. Additionally, restricting file system permissions so that the web server user has minimal read access to sensitive directories can reduce the impact of successful directory listing attempts. Regular security audits and penetration testing focusing on Ajax endpoints and unauthenticated API calls are recommended to identify similar misconfigurations in other Joomla extensions or custom code within the application ecosystem.