CVE-2026-16462: PROCON-WEB SCADA Unauthenticated SQL Injection (CVSS 9.8)

Executive Summary

A critical SQL injection vulnerability (CVE-2026-16462) has been disclosed in PROCON-WEB SCADA, a web-based supervisory control and data acquisition (SCADA) platform used in industrial environments. The GetGridData endpoint fails to sanitize user-supplied input, allowing unauthenticated remote attackers to execute arbitrary SQL commands against the underlying database.

CVSS Score: 9.8 (Critical)

This vulnerability is particularly severe given PROCON-WEB's role in operational technology (OT) environments. Successful exploitation can result in full database compromise, manipulation of industrial process data, and potential disruption of critical infrastructure operations.

Vulnerability Overview

Affected Versions

Attack Vector

1. Attacker identifies PROCON-WEB SCADA instance accessible over network
2. Attacker sends crafted HTTP request to the unsanitized GetGridData endpoint
3. Malicious SQL payload injected through unsanitized query parameter
4. Database executes arbitrary SQL commands without authentication
5. Attacker reads/modifies/deletes industrial process data and configurations
6. In advanced scenarios: OS command execution via DB stored procedures (xp_cmdshell)
7. Operational disruption — setpoint manipulation, alarm suppression, data falsification

Impact of Successful Exploitation

Immediate Remediation

Step 1: Network Isolation (Immediate)

If a patch is not yet available, isolate the PROCON-WEB SCADA interface from untrusted networks immediately:

# Block external access to PROCON-WEB at the firewall
# Allow only authorized engineering workstations to reach the SCADA web interface
# Example iptables rule (adjust interface/IP ranges for your environment)
iptables -A INPUT -p tcp --dport 80 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP

Step 2: Apply Vendor Patch

Contact your PROCON-WEB vendor immediately for a patched release addressing CVE-2026-16462. Do not operate unpatched SCADA systems on networks accessible to untrusted hosts.

Step 3: WAF Rule for GetGridData Endpoint

Deploy a WAF rule to sanitize or block SQL injection attempts against the endpoint as a compensating control:

# Block common SQL injection patterns targeting GetGridData
# Pattern: ' OR 1=1; UNION SELECT; DROP TABLE; xp_cmdshell
# Restrict GetGridData to authenticated sessions only

Step 4: Audit Database for Compromise

-- Review recent query execution history (SQL Server example)
SELECT TOP 100 qs.execution_count, qs.total_elapsed_time,
  SUBSTRING(st.text, 1, 500) AS query_text
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st
ORDER BY qs.last_execution_time DESC;
 
-- Check for unauthorized stored procedure execution
SELECT * FROM sys.traces WHERE path IS NOT NULL;
 
-- Review login audit logs for unexpected accounts
SELECT name, create_date, modify_date, type_desc
FROM sys.server_principals
WHERE type IN ('S','U') ORDER BY create_date DESC;

OT/ICS-Specific Guidance

Given PROCON-WEB's use in industrial environments, additional steps are critical:

1. Segment OT network — SCADA interfaces must not be directly accessible from corporate IT or the internet
2. Verify data integrity — audit historian data for falsified readings during the exposure window
3. Review alarm logs — check for suppressed or modified alarm configurations
4. Validate safety systems — confirm safety instrumented systems (SIS) are operating to correct setpoints
5. Notify operations — inform plant operators of potential data integrity issues
6. Engage ICS security specialists for incident response if exploitation is suspected

Detection Indicators

Post-Remediation Steps

1. Apply vendor patch and verify GetGridData endpoint is now sanitized
2. Restore network segmentation — confirm SCADA web interface is not internet-exposed
3. Rotate all database credentials used by PROCON-WEB
4. Audit historian data for the full exposure window
5. Review and validate all alarm, setpoint, and configuration data
6. Implement parameterized queries or input validation at the application layer
7. Deploy continuous OT network monitoring (e.g., Claroty, Dragos, Nozomi)
8. File ICS-CERT advisory if critical infrastructure is affected

References

• NIST NVD — CVE-2026-16462
• CISA ICS Advisories

Related Reading

• CVE-2026-11841: AppEngine Fileaccess Unauthenticated Filesystem R/W