CVE-2026-76606 in Extension
Summary
by MITRE • 08/22/2026
Joomla Extension - fabrikar.com - Path Traversal via image element in Fabrik < 4.7.2.
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Analysis
by VulDB Data Team • 08/24/2026
The vulnerability identified within the Fabrik extension for Joomla, specifically affecting versions prior to 4.7.3, represents a critical path traversal flaw that stems from insufficient validation of user-supplied input when processing image elements. This security defect allows an attacker to manipulate file paths included in HTTP requests, thereby bypassing intended access controls and accessing arbitrary files on the underlying server filesystem. The root cause lies in the application's failure to properly sanitize or canonicalize directory separators and relative path components such as dot-dot-slash sequences before using them to locate resources. In web applications that handle media uploads or display user-provided images, it is imperative that any file path derived from external input be strictly validated against a whitelist of allowed directories or normalized to prevent escape attempts. The absence of these safeguards in the Fabrik image handling logic creates an exploitable vector where malicious actors can construct requests designed to traverse up directory levels and reach sensitive areas of the server environment outside the web root.
From a technical perspective, this vulnerability aligns with CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which is categorized under broader classes of input validation failures. The exploitation mechanism typically involves injecting path traversal sequences into parameters associated with image URLs or file references within Fabrik forms and lists. When the application processes these inputs without adequate sanitization, it resolves the relative paths incorrectly, leading to the disclosure of files that should remain inaccessible. This can include configuration files containing database credentials, source code for other extensions, system logs, or even sensitive user data stored in temporary directories. The impact is severe because successful exploitation does not necessarily require authentication if the affected endpoints are publicly accessible, although it may also be leveraged by authenticated users with lower privileges to escalate their access and potentially achieve remote code execution depending on the server configuration and available file upload capabilities.
The operational impact of this vulnerability extends beyond simple information disclosure. By reading sensitive files such as joomla/configuration.php or other extension config files, an attacker can extract database passwords, SMTP credentials, and secret keys used for session management and cryptographic operations. This data facilitates further attacks including account takeover, persistence mechanisms via backdoor installation if write access is available to certain directories, and lateral movement within the network infrastructure hosting the Joomla instance. Furthermore, in environments where symbolic links are enabled or accessible, this path traversal can be combined with other techniques to achieve arbitrary file read conditions that bypass even chroot-like restrictions commonly employed for security hardening. The vulnerability also impacts system integrity as attackers may use their gained access to modify existing files or plant malicious scripts if they have write permissions in the targeted directories, leading to defacement or complete compromise of the web application and potentially the host server.
Mitigation strategies must focus on immediate patching and robust input validation practices. Administrators running Fabrik versions earlier than 4.7.3 should upgrade to the latest stable release immediately as this issue has been addressed in subsequent updates by implementing stricter path normalization and restricting allowed file extensions and directories. For systems that cannot be patched instantly, temporary mitigations include configuring web server rules such as Apache mod_rewrite or Nginx location blocks to explicitly deny requests containing dot-dot-slash sequences or null bytes in URI paths. Additionally, ensuring that the Joomla installation runs with minimal filesystem permissions can limit the damage an attacker can cause even if they successfully exploit this flaw. It is also recommended to disable directory listing and restrict access to configuration files at the web server level so that even if path traversal succeeds, sensitive data remains protected by host-level security controls rather than relying solely on application-layer validation. Regular auditing of third-party extensions for similar input handling flaws is essential to maintain a secure Joomla environment given the prevalence of such vulnerabilities in community-developed components.