CVE-2026-25951 in FUXA
Summary
by MITRE • 02/10/2026
FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. Prior to 1.2.11, there is a flaw in the path sanitization logic allows an authenticated attacker with administrative privileges to bypass directory traversal protections. By using nested traversal sequences (e.g., ....//), an attacker can write arbitrary files to the server filesystem, including sensitive directories like runtime/scripts. This leads to Remote Code Execution (RCE) when the server reloads the malicious scripts. This vulnerability is fixed in 1.2.11.
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Analysis
by VulDB Data Team • 02/14/2026
The vulnerability identified as CVE-2026-25951 affects FUXA, a web-based process visualization software commonly used in SCADA/HMI/Dashboard environments. This type of industrial control system software serves as a critical interface for monitoring and controlling industrial processes, making it a prime target for sophisticated cyber attacks. The flaw exists in the path sanitization logic of the application's file handling mechanisms, which are designed to prevent unauthorized access to the server's file system. The vulnerability specifically impacts versions prior to 1.2.11, indicating that the developers have acknowledged and addressed this security gap in their subsequent releases.
The technical implementation of this vulnerability stems from inadequate input validation within the file path processing logic. An authenticated attacker with administrative privileges can exploit this weakness by crafting malicious file paths that utilize nested directory traversal sequences such as ....//. This technique bypasses standard directory traversal protections that typically filter out single or double dots followed by forward slashes. The vulnerability's exploitation requires administrative access to the system, which aligns with the principle of least privilege and suggests that the attack vector is more sophisticated than typical user-level exploits. The flaw enables attackers to write arbitrary files to the server's file system, with particular access to sensitive directories such as runtime/scripts, which are critical components in industrial automation environments.
The operational impact of this vulnerability extends far beyond simple file manipulation capabilities. When an attacker successfully writes malicious scripts to the server's runtime directory, they can achieve Remote Code Execution (RCE) as the server reloads these malicious components. This represents a severe compromise of the industrial control system's integrity, as attackers can execute arbitrary code on the server hosting the SCADA/HMI interface. The implications are particularly concerning in industrial environments where such systems control critical infrastructure, as the potential for cascading failures, data manipulation, and operational disruptions increases dramatically. The vulnerability essentially provides attackers with a backdoor that can be used to maintain persistent access and escalate privileges within the industrial control environment, potentially leading to significant operational and security consequences.
Organizations utilizing FUXA software must prioritize immediate remediation through the upgrade to version 1.2.11 or later, which includes the necessary fixes for the path sanitization logic. The vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as directory traversal. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence, as attackers can establish backdoors through script injection and maintain access through the server's normal reload processes. Additional mitigations should include network segmentation to limit access to the FUXA server, implementing strict access controls and monitoring for unusual file creation patterns in critical directories, and conducting regular security assessments of industrial control systems to identify similar path traversal vulnerabilities in other industrial software components. The vulnerability serves as a reminder of the critical importance of input validation in industrial control systems and the need for robust security practices in environments where operational technology and information technology converge.