CVE-2026-76608 in Fabrik Extension
Summary
by MITRE • 08/22/2026
Joomla Extension - fabrikar.com - Unauthenticated disclosure of any commenter's email address in Fabrik < 4.7.2 - The onGetEmail endpoint did not perform any access checks.
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Analysis
by VulDB Data Team • 08/22/2026
The vulnerability identified within the Fabrik extension for Joomla, specifically affecting versions prior to 4.7.2, represents a critical failure in access control mechanisms that allows unauthenticated users to retrieve sensitive personal information from the application database. This issue centers on the onGetEmail endpoint, which was designed to facilitate specific functionality related to comment handling or user interaction but lacked any form of authentication verification or authorization checks before processing requests. As a result, an attacker who is not logged into the Joomla site can directly interact with this API endpoint by crafting and sending HTTP requests without providing valid session tokens or credentials. The absence of these security controls means that the server processes the request as if it were coming from an authorized user, thereby bypassing the intended security boundaries established by the framework's authentication layer.
From a technical perspective, this flaw is classified under CWE-284, which describes Improper Access Control, and more specifically aligns with CWE-798, indicating the use of hardcoded or default credentials in some contexts where access should be restricted, although here it manifests as a complete lack of required authentication for a sensitive operation. The vulnerability allows an external actor to query the backend database directly through the exposed endpoint, extracting email addresses associated with any commenter who has previously interacted with content managed by Fabrik. This data exposure is significant because email addresses are often used in conjunction with other personal identifiable information (PII) for targeted phishing attacks, credential stuffing attempts, or social engineering campaigns. The attacker does not need to exploit a complex chain of vulnerabilities; instead, they can leverage this single misconfiguration to harvest large volumes of user emails by iterating through known comment IDs or utilizing enumeration techniques if the endpoint accepts sequential identifiers without rate limiting or validation.
The operational impact of this vulnerability extends beyond simple data leakage. By obtaining valid email addresses from the site's community, attackers can build targeted lists for spam campaigns that may compromise other services where users have reused passwords. Furthermore, in environments where Fabrik is used to manage sensitive forms or user-generated content, the exposure of commenter identities undermines privacy expectations and potentially violates regulatory compliance frameworks such as GDPR or CCPA, which mandate strict protection of personal data. The ease of exploitation means that automated tools can rapidly scan for this endpoint across multiple Joomla installations, leading to widespread compromise if administrators have not applied timely patches or implemented compensating controls. This type of vulnerability is often mapped to the ATT&CK technique T1078, Valid Accounts, although in this case, it exploits a lack of account requirement rather than stolen credentials, falling closer to data exfiltration techniques where sensitive information is accessed without proper authorization checks as described in MITRE ATT&CK sub-techniques related to Application Data Access.
To mitigate this risk, immediate action must be taken by updating the Fabrik extension to version 4.7.2 or later, which includes patches for these access control deficiencies. Administrators should verify that all extensions are up-to-date and review custom code modifications if any have been applied to the core files of the component, as updates may overwrite such changes. In addition to patching, implementing a Web Application Firewall (WAF) can provide an additional layer of defense by blocking requests to known vulnerable endpoints or detecting anomalous patterns indicative of enumeration attacks. It is also advisable to review server logs for signs of exploitation and rotate any potentially compromised credentials if there is evidence that the email addresses have been harvested. Regular security audits focusing on API endpoint authorization logic are recommended to prevent similar misconfigurations in other parts of the application, ensuring that all data retrieval operations enforce strict authentication and role-based access controls consistent with industry best practices for secure software development.