CVE-2026-21410 is a critical vulnerability identified in InSAT MasterSCADA BUK-TS, a supervisory control and data acquisition (SCADA) system widely used in industrial environments. The vulnerability is a classic SQL Injection (CWE-89) flaw present in the main web interface of the product, affecting all versions. This flaw allows remote attackers to inject malicious SQL queries without requiring authentication or user interaction. The injection can be leveraged to manipulate backend databases, potentially leading to unauthorized data access, data modification, or deletion. More critically, the vulnerability can be escalated to remote code execution (RCE), enabling attackers to execute arbitrary commands on the underlying system. The CVSS v3.1 base score of 9.8 reflects the vulnerability's high exploitability (network attack vector, no privileges or user interaction needed) and severe impact on confidentiality, integrity, and availability. The vulnerability was reserved on February 9, 2026, and published on February 24, 2026. Although no public exploits have been reported yet, the nature of SCADA systems and their critical role in industrial control makes this a high-priority security concern. The lack of available patches at the time of disclosure necessitates immediate defensive measures to mitigate risk.

The impact of CVE-2026-21410 is profound for organizations operating industrial control systems using InSAT MasterSCADA BUK-TS. Exploitation can lead to full compromise of the SCADA system, allowing attackers to manipulate industrial processes, disrupt operations, steal sensitive operational data, or cause physical damage by altering control commands. The ability to achieve remote code execution without authentication significantly raises the risk of widespread attacks, including ransomware or sabotage. This can result in operational downtime, safety hazards, financial losses, regulatory penalties, and damage to organizational reputation. Given the critical nature of SCADA systems in sectors such as energy, manufacturing, water treatment, and transportation, the vulnerability poses a threat to national infrastructure security and public safety. The absence of known exploits currently provides a window for proactive defense, but the vulnerability’s severity demands urgent attention.

1. Immediately restrict network access to the MasterSCADA BUK-TS web interface using firewalls, VPNs, or network segmentation to limit exposure to trusted personnel only. 2. Monitor network traffic and system logs for unusual SQL queries or unauthorized access attempts targeting the SCADA interface. 3. Employ Web Application Firewalls (WAFs) with custom rules to detect and block SQL Injection patterns specific to the MasterSCADA interface. 4. Coordinate with InSAT for timely release and application of official security patches or updates addressing CVE-2026-21410. 5. Conduct thorough security assessments and penetration testing on SCADA deployments to identify and remediate other potential injection points. 6. Implement strict input validation and parameterized queries in any custom integrations or extensions of the SCADA system. 7. Develop and rehearse incident response plans tailored to SCADA compromise scenarios to minimize operational impact. 8. Educate operational technology (OT) staff on recognizing and responding to signs of exploitation attempts.