CVE-2026-62069 in Fabius Plugin
Summary
by MITRE • 10/10/2026
Unauthenticated Local File Inclusion in Fabius <= 1.0 versions.
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Analysis
by VulDB Data Team • 10/10/2026
The vulnerability identified as an unauthenticated local file inclusion flaw within Fabius version 1.0 and earlier represents a critical security deficiency that allows attackers to read arbitrary files from the underlying server operating system without requiring any form of authentication or user interaction. This type of vulnerability typically arises when a web application fails to properly sanitize input parameters before using them in functions that include local file paths, such as PHP's include() or require() constructs. In the context of Fabius, which is often deployed for managing IoT devices and network configurations, this flaw exposes sensitive system files, configuration data containing credentials, source code, and potentially other critical application logic to unauthorized parties. The absence of authentication requirements significantly lowers the barrier to entry for attackers, enabling any remote actor with network access to exploit the issue directly through crafted HTTP requests targeting specific file paths on the server.
From a technical perspective, local file inclusion vulnerabilities occur when an application constructs a file path dynamically based on user-supplied input without adequate validation or restriction of allowed characters and directories. An attacker can manipulate this input by utilizing directory traversal sequences such as dot-dot-slash to escape the intended web root directory and access files located elsewhere in the filesystem hierarchy. This capability is particularly dangerous because it bypasses standard application-level security controls that might otherwise restrict file access to specific directories or require session tokens for sensitive operations. The exploitation of this flaw does not rely on complex buffer overflows or memory corruption techniques but rather exploits logical errors in how the server processes and resolves relative paths, making it a straightforward yet highly impactful attack vector against misconfigured or poorly coded web applications.
The operational impact of this vulnerability is severe, as successful exploitation can lead to full system compromise depending on what files are accessible and their contents. If sensitive configuration files containing database passwords, API keys, or administrative credentials are exposed, attackers can gain persistent access to the backend infrastructure and associated IoT devices managed by Fabius. Furthermore, reading source code may reveal additional vulnerabilities within the application logic itself, facilitating further exploitation chains such as remote code execution if other insecure functions like eval() are present in the included files. This vulnerability also facilitates information disclosure that aids in reconnaissance efforts, allowing attackers to map out the server environment and identify potential targets for subsequent attacks against connected devices or network segments.
To mitigate this risk, immediate remediation involves upgrading Fabius to a version where this flaw has been patched by the vendor. Until an update is available, administrators should implement strict input validation on all parameters that are used in file inclusion operations, ensuring that only expected and whitelisted values are accepted. Additionally, configuring the web server to disable directory listing and restricting PHP include paths via open_basedir directives can limit the scope of files accessible through such attacks. Network-level controls such as firewalls should be configured to restrict access to Fabius interfaces to trusted IP addresses only, reducing the attack surface exposed to potential remote exploitation attempts. Regular security audits and static code analysis tools should also be employed during development cycles to detect similar patterns before deployment into production environments.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-98 Improper Control of Filename for Include/Require Statement in PHP Program, which categorizes the failure to validate user-supplied filenames used in include or require statements. It is also associated with MITRE ATT&CK technique T1083 File and Directory Discovery, as attackers use this flaw to enumerate sensitive files on the target system. The lack of authentication requirement places it within the broader category of unauthenticated access vulnerabilities that are frequently exploited in automated scanning campaigns targeting exposed web services. Organizations relying on Fabius for IoT management must treat this issue with high priority due to its potential to compromise not only the application server but also the integrity and confidentiality of the entire connected device ecosystem.