CVE-2026-25751 is a critical security vulnerability identified in frangoteam's FUXA software, a web-based process visualization tool commonly used in SCADA, HMI, and dashboard environments. The vulnerability stems from a missing authentication mechanism on a critical function that exposes sensitive administrative database credentials to unauthenticated remote attackers. Specifically, attackers can retrieve the full system configuration, including administrative credentials for the InfluxDB database backend. With these credentials, attackers can directly authenticate to the InfluxDB service, allowing them to read, modify, or delete all historical process data. This can severely impact the integrity and availability of industrial process data, potentially disrupting operations or causing denial of service by corrupting the database. The vulnerability affects all FUXA versions prior to 1.2.10 and has been assigned a CVSS 4.0 score of 9.1, reflecting its critical nature. The attack vector is network-based, requiring no privileges or user interaction, and the scope includes high confidentiality and integrity impacts. Although no exploits have been observed in the wild yet, the vulnerability’s characteristics make it a prime target for attackers aiming to compromise industrial control systems. The root cause is categorized under CWE-306 (Missing Authentication for Critical Function) and CWE-312 (Cleartext Storage of Sensitive Information), indicating poor security controls around authentication and credential management. The vendor has released a patch in version 1.2.10 to address this issue.

The impact of CVE-2026-25751 on European organizations is substantial, particularly for those operating in industrial sectors such as manufacturing, energy, utilities, and critical infrastructure that rely on FUXA for process visualization and control. Unauthorized access to administrative database credentials can lead to full compromise of process data integrity and availability, potentially causing operational disruptions, production downtime, and safety risks. Attackers could manipulate historical data to hide malicious activities or cause erroneous process control decisions. The ability to delete or corrupt data can result in costly recovery efforts and regulatory non-compliance, especially under EU regulations like NIS2 and GDPR if personal or operational data is affected. Furthermore, the lack of authentication means attackers can exploit this vulnerability remotely without prior access, increasing the risk of widespread attacks. European organizations with interconnected industrial networks or those exposing FUXA interfaces to less secure network segments face elevated risks. The vulnerability also poses a threat to supply chain security, as compromised process data can affect product quality and reliability.

To mitigate CVE-2026-25751, European organizations should immediately upgrade FUXA installations to version 1.2.10 or later, where the vulnerability has been patched. Until patching is complete, restrict network access to FUXA management interfaces using firewalls, VPNs, or network segmentation to limit exposure to trusted personnel only. Implement strict access controls and monitor authentication logs for unusual activity. Additionally, rotate InfluxDB administrative credentials and audit database access logs for signs of unauthorized access. Employ network intrusion detection systems (NIDS) to detect anomalous traffic patterns targeting FUXA or InfluxDB services. Conduct regular security assessments and penetration tests focusing on SCADA and industrial control system components. Educate operational technology (OT) staff about the risks of exposing critical management interfaces and enforce policies to avoid default or weak credentials. Finally, consider deploying application-layer firewalls or web application firewalls (WAFs) to provide an additional layer of defense against exploitation attempts.