CVE-2026-2621 Overview
A SQL injection vulnerability has been identified in the Sciyon Koyuan Thermoelectricity Heat Network Management System version 3.0. The vulnerability exists in the file /SISReport/WebReport20/Proxy/AsyncTreeProxy.aspx and can be exploited through manipulation of the PGUID argument. This flaw allows remote attackers to inject malicious SQL commands, potentially compromising the underlying database and gaining unauthorized access to sensitive system data.
Critical Impact
Remote attackers can exploit this SQL injection vulnerability to extract, modify, or delete data from the backend database without authentication. The vendor was contacted about this disclosure but did not respond.
Affected Products
- Sciyon Koyuan Thermoelectricity Heat Network Management System 3.0
Discovery Timeline
- 2026-02-17 - CVE-2026-2621 published to NVD
- 2026-02-18 - Last updated in NVD database
Technical Details for CVE-2026-2621
Vulnerability Analysis
This vulnerability is classified as an injection flaw (CWE-74) that manifests through improper handling of user-supplied input in the AsyncTreeProxy.aspx component. The application fails to properly sanitize or parameterize the PGUID argument before incorporating it into SQL queries, creating a classic SQL injection attack surface.
The network-accessible nature of the vulnerable endpoint means attackers can remotely target the system without requiring local access or prior authentication. When successfully exploited, this vulnerability can lead to unauthorized data access, data manipulation, and potential system compromise depending on the database privileges of the application.
Root Cause
The root cause stems from insufficient input validation and improper construction of SQL queries. The application directly incorporates user-controlled input from the PGUID parameter into database queries without adequate sanitization, parameterized queries, or prepared statements. This allows attackers to break out of the intended query context and inject arbitrary SQL commands.
Attack Vector
The attack is initiated remotely over the network by sending crafted HTTP requests to the vulnerable endpoint at /SISReport/WebReport20/Proxy/AsyncTreeProxy.aspx. An attacker manipulates the PGUID parameter with SQL injection payloads designed to alter the query logic, extract database contents, or perform other malicious database operations.
The vulnerability can be exploited without authentication, making it particularly dangerous for internet-exposed installations. Technical details regarding the specific injection technique have been publicly disclosed. For more information, see the GitHub SQL Injection Vulnerability report and VulDB #346272.
Detection Methods for CVE-2026-2621
Indicators of Compromise
- Unusual HTTP requests to /SISReport/WebReport20/Proxy/AsyncTreeProxy.aspx containing SQL syntax in the PGUID parameter
- Database error messages or unusual query execution patterns in application logs
- Unexpected database queries originating from the web application context
- Abnormal data access patterns or bulk data extraction from the database
Detection Strategies
- Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP requests targeting AsyncTreeProxy.aspx
- Implement database activity monitoring to identify suspicious query patterns, including UNION-based, boolean-based, or time-based blind injection attempts
- Configure application logging to capture all requests to the vulnerable endpoint for forensic analysis
Monitoring Recommendations
- Monitor web server access logs for requests to /SISReport/WebReport20/Proxy/AsyncTreeProxy.aspx with suspicious parameter values
- Set up alerts for database error conditions that may indicate failed injection attempts
- Track unusual database read operations or data exfiltration patterns
- Implement network monitoring for unusual outbound connections from the database server
How to Mitigate CVE-2026-2621
Immediate Actions Required
- Restrict network access to the Heat Network Management System to trusted IP addresses only
- Implement a Web Application Firewall (WAF) with SQL injection protection rules targeting the vulnerable endpoint
- Consider temporarily disabling or restricting access to the /SISReport/WebReport20/Proxy/AsyncTreeProxy.aspx component until a patch is available
- Review database user privileges and implement least-privilege access for the application
Patch Information
No official patch has been released by the vendor. The vendor was contacted early about this disclosure but did not respond in any way. Organizations using this product should contact Sciyon directly for remediation guidance or consider implementing compensating controls until a patch becomes available.
Workarounds
- Implement network segmentation to isolate the vulnerable system from untrusted networks
- Deploy input validation at the network perimeter using a reverse proxy or WAF to filter malicious SQL injection payloads
- Restrict access to the management interface to authorized internal users only via VPN or firewall rules
- Consider implementing database-level query monitoring and blocking for anomalous patterns
# Example WAF rule configuration (ModSecurity format)
SecRule ARGS:PGUID "@rx (?i)(\b(select|union|insert|update|delete|drop|exec|execute)\b|--|;|')" \
"id:100001,phase:2,deny,status:403,log,msg:'SQL Injection attempt on AsyncTreeProxy.aspx'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
