CVE-2026-2621
Published: 17 February 2026
Summary
CVE-2026-2621 is a medium-severity Injection (CWE-74) vulnerability. Its CVSS base score is 6.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 13.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and AC-3 (Access Enforcement).
Deeper analysis
CVE-2026-2621 is a SQL injection vulnerability in the Sciyon Koyuan Thermoelectricity Heat Network Management System version 3.0. The issue resides in an unknown part of the file /SISReport/WebReport20/Proxy/AsyncTreeProxy.aspx, where manipulation of the PGUID argument triggers the injection. Associated with CWE-74 (Improper Neutralization of Special Elements used in an SQL Command) and CWE-89 (SQL Injection), it carries a CVSS v3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L), indicating high severity.
The vulnerability enables remote exploitation without authentication or user interaction. Attackers with network access can send crafted requests to the affected endpoint, potentially extracting sensitive data, modifying database contents, or disrupting service availability, albeit with low impact levels across confidentiality, integrity, and availability.
Advisories from VulDB (ctiid.346272, id.346272, submit.751809) and a GitHub repository detail the proof-of-concept exploit, which has been publicly disclosed. The vendor was notified early but provided no response, and no patches or mitigations are referenced.
The exploit is available publicly and may be actively used, targeting critical infrastructure like heat network management systems.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-7657
Vulnerability details
A security vulnerability has been detected in Sciyon Koyuan Thermoelectricity Heat Network Management System 3.0. This affects an unknown part of the file /SISReport/WebReport20/Proxy/AsyncTreeProxy.aspx. The manipulation of the argument PGUID leads to sql injection. The attack can be initiated remotely.…
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The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
SQL injection in unauthenticated public-facing web endpoint directly enables remote exploitation (T1190); crafted queries allow direct collection from the backend database (T1213.006) and stored data manipulation (T1565.001).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of untrusted inputs such as the PGUID parameter before they are used in SQL statements, blocking the injection vector in AsyncTreeProxy.aspx.
Enforces access-control checks prior to processing requests to the unauthenticated endpoint, preventing anonymous attackers from reaching the vulnerable SQL code path.
Enables continuous monitoring and anomaly detection on web-application traffic and database queries to identify crafted PGUID payloads indicative of SQL injection attempts.