CVE-2026-5964: EasyFlow .NET SQL Injection Vulnerability

CVE-2026-5964 Overview

CVE-2026-5964 is a SQL Injection vulnerability affecting EasyFlow .NET, a workflow automation solution developed by Digiwin. This critical vulnerability allows unauthenticated remote attackers to inject arbitrary SQL commands, enabling them to read, modify, and delete database contents without authentication. The network-accessible nature of this flaw makes it particularly dangerous in enterprise environments where EasyFlow is deployed.

Critical Impact

Unauthenticated attackers can fully compromise database integrity, confidentiality, and availability through arbitrary SQL command injection.

Affected Products

• EasyFlow .NET by Digiwin (affected versions not specified)

Discovery Timeline

• April 20, 2026 - CVE-2026-5964 published to NVD
• April 20, 2026 - Last updated in NVD database

Technical Details for CVE-2026-5964

Vulnerability Analysis

This vulnerability is classified as CWE-89 (SQL Injection), one of the most prevalent and dangerous web application security flaws. The vulnerability exists because the EasyFlow .NET application fails to properly sanitize user-supplied input before incorporating it into SQL queries. This lack of input validation allows attackers to manipulate database queries by injecting malicious SQL code through application parameters.

The impact of successful exploitation is severe: attackers can extract sensitive data from the database, modify or delete records, and potentially escalate their access to underlying system resources. In enterprise workflow environments, this could lead to exposure of confidential business processes, customer data, and internal communications.

Root Cause

The root cause of CVE-2026-5964 is improper input validation and the use of unsanitized user input in database queries. The EasyFlow .NET application constructs SQL statements by directly concatenating user-controlled data without employing parameterized queries, prepared statements, or adequate input sanitization mechanisms. This allows attackers to break out of the intended query structure and execute arbitrary SQL commands.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can remotely target exposed EasyFlow .NET instances by crafting malicious HTTP requests containing SQL injection payloads. These payloads are processed by the application and passed directly to the database engine, where the injected SQL commands are executed with the application's database privileges.

Typical exploitation scenarios include:

• Extracting database schemas and sensitive data using UNION-based injection
• Modifying or deleting critical workflow data
• Bypassing authentication mechanisms through authentication table manipulation
• Potentially achieving remote code execution if database features like xp_cmdshell (SQL Server) are enabled

Detection Methods for CVE-2026-5964

Indicators of Compromise

• Unusual SQL error messages in application logs or HTTP responses
• Database queries containing SQL keywords in unexpected parameters (e.g., UNION SELECT, OR 1=1, DROP TABLE)
• Anomalous database activity such as bulk data extraction or unauthorized schema queries
• Web access logs showing requests with SQL injection patterns in URL parameters or POST data

Detection Strategies

• Deploy Web Application Firewalls (WAF) with SQL injection detection rules enabled
• Implement database activity monitoring to detect suspicious query patterns
• Configure intrusion detection systems (IDS) with signatures for common SQL injection techniques
• Enable detailed logging on the EasyFlow application and database servers for forensic analysis

Monitoring Recommendations

• Monitor network traffic to EasyFlow endpoints for SQL injection payload patterns
• Set up alerts for database errors related to syntax issues that could indicate injection attempts
• Review authentication logs for signs of credential dumping or authentication bypass
• Establish baseline query behavior and alert on deviations that may indicate exploitation

How to Mitigate CVE-2026-5964

Immediate Actions Required

• Restrict network access to EasyFlow .NET instances using firewall rules and network segmentation
• Place a Web Application Firewall (WAF) in front of the application with SQL injection protection enabled
• Review database user privileges and apply the principle of least privilege
• Enable comprehensive logging and monitor for exploitation attempts

Patch Information

Organizations should consult the TWCERT Security Advisory for official guidance from the Taiwan Computer Emergency Response Team. Contact Digiwin directly for information about security patches and updated versions of EasyFlow .NET that address this vulnerability.

Workarounds

• Implement network-level access controls to limit exposure of the EasyFlow application to trusted networks only
• Deploy a WAF with OWASP ModSecurity Core Rule Set (CRS) to block SQL injection attempts
• If possible, disable or restrict access to vulnerable endpoints until a patch is available
• Consider taking the application offline if it processes sensitive data and no mitigations are feasible

# Example: Restrict access to EasyFlow using iptables (Linux)
# Allow only trusted network ranges to access the application port
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP