CVE-2026-5963: EasyFlow .NET SQL Injection Vulnerability

CVE-2026-5963 Overview

EasyFlow .NET, developed by Digiwin, contains a SQL Injection vulnerability (CWE-89) that allows unauthenticated remote attackers to inject arbitrary SQL commands. This critical flaw enables malicious actors to read, modify, and delete database contents without requiring any authentication, posing severe risks to data integrity and confidentiality.

Critical Impact

Unauthenticated attackers can execute arbitrary SQL commands to compromise the entire database, including reading sensitive data, modifying records, and deleting critical information.

Affected Products

• EasyFlow .NET by Digiwin

Discovery Timeline

• 2026-04-20 - CVE-2026-5963 published to NVD
• 2026-04-20 - Last updated in NVD database

Technical Details for CVE-2026-5963

Vulnerability Analysis

This SQL Injection vulnerability exists within EasyFlow .NET, a workflow management solution developed by Digiwin. The application fails to properly sanitize user-supplied input before incorporating it into SQL queries, creating a classic injection point that attackers can exploit remotely over the network.

The vulnerability requires no authentication and no user interaction to exploit successfully. An attacker can craft malicious SQL statements that, when processed by the application, execute directly against the backend database. This grants complete access to database operations including SELECT, INSERT, UPDATE, and DELETE commands, effectively giving attackers full control over the application's data layer.

Root Cause

The root cause is improper input validation (CWE-89: Improper Neutralization of Special Elements used in an SQL Command). User-controlled input is concatenated directly into SQL queries without proper parameterization or sanitization. This allows attackers to break out of the intended query structure and inject their own SQL commands.

Attack Vector

The attack is conducted remotely over the network without requiring authentication. Attackers can submit specially crafted input containing SQL metacharacters and commands through application interfaces. When this malicious input reaches the database layer, the injected SQL statements execute with the same privileges as the application's database connection.

The exploitation process typically involves:

1. Identifying input fields or API endpoints that interact with the database
2. Testing for SQL injection by submitting SQL metacharacters (quotes, semicolons, comment markers)
3. Crafting payloads to extract database schema information
4. Escalating to data exfiltration, modification, or deletion depending on attacker objectives

For detailed technical information, refer to the TWCERT Security Notification.

Detection Methods for CVE-2026-5963

Indicators of Compromise

• Unusual database query patterns containing SQL metacharacters such as single quotes, double dashes, or UNION statements in application logs
• Unexpected database errors or verbose error messages returned to clients
• Anomalous data access patterns including bulk data retrieval or unauthorized data modifications
• Database audit logs showing queries attempting to access system tables or execute administrative commands

Detection Strategies

• Deploy Web Application Firewalls (WAF) configured with SQL injection detection rules to inspect incoming requests
• Enable database query logging and monitor for suspicious query patterns including UNION SELECT, stacked queries, or time-based blind injection attempts
• Implement application-layer logging to capture all user inputs for forensic analysis
• Use intrusion detection systems (IDS) with signatures for common SQL injection attack patterns

Monitoring Recommendations

• Configure real-time alerting for database error rates that may indicate injection probing
• Monitor application response times for anomalies that could indicate time-based blind SQL injection
• Review database connection logs for unusual connection patterns or privilege escalation attempts
• Establish baseline metrics for normal database query volumes and alert on significant deviations

How to Mitigate CVE-2026-5963

Immediate Actions Required

• Restrict network access to EasyFlow .NET instances to trusted networks and authorized users only
• Implement a Web Application Firewall (WAF) with SQL injection protection as an interim measure
• Review and audit all database access logs for signs of prior exploitation
• Apply principle of least privilege to the database account used by the application

Patch Information

Contact Digiwin directly for official patch availability and remediation guidance. Monitor the TWCERT Security Notification and TWCERT Incident Report for updates on official fixes.

Workarounds

• Place the application behind a reverse proxy with strict input validation rules
• Implement network segmentation to isolate the EasyFlow .NET application and its database from other systems
• Disable or restrict public network access to the application until a patch is applied
• Consider taking the application offline if it handles highly sensitive data and cannot be adequately protected

# Example WAF rule configuration (ModSecurity)
# Block common SQL injection patterns
SecRule ARGS "@detectSQLi" \
    "id:1001,\
    phase:2,\
    block,\
    msg:'SQL Injection Attack Detected',\
    logdata:'Matched Data: %{MATCHED_VAR} found within %{MATCHED_VAR_NAME}',\
    severity:'CRITICAL'"