CVE-2026-16462 Overview
CVE-2026-16462 is a SQL injection vulnerability in PROCON-WEB SCADA. The GetGridData endpoint fails to sanitize user-supplied input before passing it to the backend database. Remote unauthenticated attackers can execute arbitrary SQL commands against the affected system. The flaw is classified under CWE-89, SQL Injection. PROCON-WEB is a Supervisory Control and Data Acquisition (SCADA) platform used in industrial control environments, so successful exploitation carries operational technology (OT) risk.
Critical Impact
An unauthenticated remote attacker can execute arbitrary SQL commands against the PROCON-WEB SCADA database, exposing confidentiality, integrity, and availability of industrial process data.
Affected Products
- PROCON-WEB SCADA (see CERT@VDE Advisory VDE-2026-085 for affected versions)
Discovery Timeline
- 2026-07-28 - CVE-2026-16462 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-16462
Vulnerability Analysis
The vulnerability resides in the GetGridData endpoint of PROCON-WEB SCADA. The endpoint accepts client-supplied parameters and incorporates them into SQL queries without proper sanitization or parameterization. An attacker can inject SQL syntax through these parameters and alter the intended query structure. Because the endpoint is reachable without authentication, exploitation requires no credentials, no user interaction, and no prior foothold. Attackers can read arbitrary database records, modify configuration and process data, or issue destructive statements depending on the database privileges assigned to the SCADA service account. In industrial contexts, tampering with SCADA datastores can distort operator views, corrupt historian records, or influence downstream control decisions.
Root Cause
The root cause is missing input validation and the use of dynamic SQL construction in the GetGridData handler. User-controlled data is concatenated into query strings rather than bound through parameterized statements. This pattern maps directly to CWE-89: Improper Neutralization of Special Elements used in an SQL Command.
Attack Vector
Exploitation occurs over the network against the PROCON-WEB HTTP interface. The attacker sends a crafted request to the GetGridData endpoint containing SQL metacharacters or stacked query syntax in a vulnerable parameter. No authentication headers, session tokens, or user interaction are required. Successful requests return manipulated result sets or trigger side effects such as data modification. The vendor advisory at CERT@VDE VDE-2026-085 provides authoritative technical details and fixed-version guidance.
Detection Methods for CVE-2026-16462
Indicators of Compromise
- HTTP requests to the GetGridData endpoint containing SQL metacharacters such as ', --, ;, UNION, SELECT, WAITFOR, or SLEEP.
- Unauthenticated requests to GetGridData originating from IP addresses outside the operator or engineering network.
- Database error messages, stack traces, or unusually large result sets returned by GetGridData responses.
- Unexpected changes to SCADA configuration tables, tag definitions, or historian records.
Detection Strategies
- Inspect web server and application logs for GetGridData requests with suspicious query parameters or encoded SQL keywords.
- Deploy a web application firewall (WAF) rule set that flags SQL injection patterns targeting SCADA HTTP endpoints.
- Enable database audit logging and alert on ad-hoc statements issued by the PROCON-WEB service account outside expected query templates.
- Correlate SCADA HTTP traffic with network baselines to identify sources that should not communicate with the control system.
Monitoring Recommendations
- Forward PROCON-WEB HTTP access logs and database audit logs to a centralized SIEM for retention and correlation.
- Alert on high volumes of GetGridData requests, elevated error rates, or long-running queries associated with the endpoint.
- Monitor egress from the SCADA server for unexpected outbound connections that could indicate post-exploitation data exfiltration.
How to Mitigate CVE-2026-16462
Immediate Actions Required
- Apply the fixed PROCON-WEB SCADA version identified in CERT@VDE Advisory VDE-2026-085 as soon as operationally feasible.
- Restrict network access to the PROCON-WEB HTTP interface so only authorized operator and engineering workstations can reach it.
- Review database audit logs and SCADA configuration tables for signs of unauthorized queries or data modification.
- Rotate credentials used by the PROCON-WEB database service if compromise is suspected.
Patch Information
Refer to the vendor advisory published by CERT@VDE at VDE-2026-085 for fixed versions and upgrade instructions. Apply the update in a change-controlled window consistent with ICS operational requirements.
Workarounds
- Place the PROCON-WEB server behind a WAF or reverse proxy that blocks SQL injection patterns against the GetGridData endpoint.
- Segment the SCADA network from corporate and internet-facing zones using firewall rules that deny inbound HTTP to control systems.
- Enforce least privilege on the database account used by PROCON-WEB, removing rights to modify schema or execute administrative statements.
- Disable or block external access to the GetGridData endpoint until the patch is applied, where operationally acceptable.
# Example firewall rule limiting PROCON-WEB HTTP access to an engineering subnet
iptables -A INPUT -p tcp --dport 80 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
