CVE-2026-2621 identifies a SQL injection vulnerability in the Sciyon Koyuan Thermoelectricity Heat Network Management System version 3.0, specifically within the /SISReport/WebReport20/Proxy/AsyncTreeProxy.aspx file. The vulnerability arises from improper handling of the PGUID parameter, which can be manipulated by an unauthenticated remote attacker to inject malicious SQL queries. This flaw allows attackers to bypass security controls, potentially accessing or modifying sensitive database information related to the heat network management system. The vulnerability does not require user interaction or authentication, increasing its exploitability. The vendor was notified early but has not issued a patch or response, leaving systems exposed. The CVSS 4.0 base score is 6.9, reflecting medium severity due to the ease of remote exploitation and potential impact on confidentiality, integrity, and availability of the system. Although no exploits are currently known in the wild, public disclosure means attackers could develop exploits. The affected system is critical for managing thermoelectric heat networks, which are essential for energy distribution and infrastructure management. Exploitation could lead to unauthorized data disclosure, data tampering, or operational disruption, impacting service reliability and safety.

The impact of CVE-2026-2621 is significant for organizations relying on the Sciyon Koyuan Thermoelectricity Heat Network Management System 3.0. Successful exploitation could lead to unauthorized access to sensitive operational data, manipulation of heat network configurations, or disruption of service availability. This could compromise the integrity and availability of critical energy infrastructure, potentially causing cascading effects on energy distribution and public safety. Confidentiality breaches could expose operational details to adversaries, facilitating further attacks or industrial espionage. The lack of authentication and remote exploitability increases the risk of widespread attacks, especially in environments where the system is accessible over networks without adequate segmentation. The absence of vendor patches prolongs exposure, increasing the window for attackers to develop and deploy exploits. Organizations may face operational downtime, regulatory penalties, and reputational damage if the vulnerability is exploited.

To mitigate CVE-2026-2621, organizations should implement the following specific measures: 1) Immediately restrict network access to the affected AsyncTreeProxy.aspx endpoint by applying firewall rules or network segmentation to limit exposure to trusted internal networks only. 2) Employ Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting the PGUID parameter. 3) Conduct thorough input validation and sanitization on all parameters, especially PGUID, to prevent injection of malicious SQL code. 4) Monitor logs and network traffic for unusual queries or access patterns indicative of exploitation attempts. 5) If possible, deploy virtual patching techniques to intercept and neutralize malicious requests until an official patch is released. 6) Engage with the vendor for updates and consider alternative solutions if remediation is delayed. 7) Implement regular security assessments and penetration testing focused on this vulnerability. 8) Educate operational technology and IT teams about the risk and signs of exploitation to ensure rapid detection and response.