CVE-2026-76599 in Extension
Summary
by MITRE • 08/22/2026
Joomla Extension - fabrikar.com - Unauthenticated database table list and table-prefix disclosure in Fabrik < 4.7.2 - The ajax_tables method of the elements model allows listings of arbitrary database tables including columns.
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Analysis
by VulDB Data Team • 08/22/2026
The vulnerability identified within Joomla extensions, specifically affecting versions of Fabrik prior to release 4.7.2, represents a critical information disclosure flaw rooted in insufficient access control mechanisms on server-side endpoints. The core technical issue resides within the ajax_tables method located in the elements model component of the application. This specific function is designed to facilitate dynamic table interactions but fails to enforce proper authentication or authorization checks before processing requests from unauthenticated users. Consequently, any external actor can invoke this endpoint without valid session credentials or API keys, bypassing standard security boundaries that should restrict such administrative-level data retrieval operations.
From a technical perspective, the flaw allows for arbitrary database enumeration by leveraging the exposed method to query and return metadata about the underlying MySQL database structure. The attacker can request lists of all available tables within the Joomla installation, including sensitive system tables used for user management, configuration storage, and extension settings. Furthermore, the vulnerability extends beyond mere table listing; it permits the disclosure of column names and potentially data types associated with these tables. This level of granularity provides a detailed map of the database schema, which is invaluable intelligence for subsequent stages of an attack lifecycle where precise knowledge of field structures enables targeted injection attacks or efficient credential harvesting strategies.
The operational impact of this vulnerability is significant as it serves as a foundational step in many multi-stage exploitation campaigns. By obtaining the full database schema, attackers can identify specific tables containing hashed passwords, such as jos_users, and determine the exact column names required for SQL injection payloads to extract these credentials. Additionally, knowledge of configuration tables allows adversaries to locate paths to sensitive files or retrieve API keys and secret tokens stored in the database that might not be easily accessible through other means. This information disclosure effectively lowers the barrier for entry, transforming a potentially complex exploitation scenario into a straightforward data extraction process, thereby compromising the confidentiality integrity of the entire web application ecosystem.
In terms of industry standard classifications, this vulnerability aligns with CWE-200: Information Exposure and CWE-611: Improper Restriction of XML External Entity Reference if interpreted broadly as improper input validation leading to information leakage, though more accurately it falls under CWE-942: Permissive Cross-domain Whitelist or specifically CWE-778: Insufficient Initial Disclosure. In the context of the MITRE ATT&CK framework, this behavior corresponds to T1005: Data from Local System and potentially feeds into T1087: Account Discovery as attackers use the schema information to locate user accounts for further credential-based attacks. The lack of authentication on an administrative function is a classic example of broken access control that undermines the security posture of the application.
To mitigate this vulnerability, immediate action must be taken by upgrading the Fabrik extension to version 4.7.2 or later where these access controls have been rectified. For organizations unable to patch immediately due to compatibility constraints, temporary mitigations should include implementing web application firewall rules that block requests targeting the specific ajax_tables endpoint unless they originate from trusted internal sources with valid session tokens. Additionally, database users associated with the Joomla installation should be configured with the principle of least privilege, ensuring that the database account used by the web application does not have excessive permissions such as SELECT on system tables if those are not strictly required for normal operation. Regular security audits and penetration testing focusing on unauthenticated endpoints can help identify similar flaws in other components before they are exploited in production environments.