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CVE-2026-11858

Status: DeferredHigh (8.4)—

Quanos SCHEMA ST4 on-premises contains a local privilege escalation vulnerability in the Client Update Service. The update service runs as NT AUTHORITY\SYSTEM and exposes a .NET Remoting interface over a named pipe without sufficient access controls or authorization. A local authenticated low-privileged user can connect to the interface and invoke privileged update methods such as Update(). This allows arbitrary file write and delete operations with SYSTEM privileges and can be used to achieve local privilege escalation.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vulnerabilidad local con PR:L que permite escalada de privilegios invocando métodos privilegiados en servicio .NET Remoting. AV:L, PR:L, UI:N → T1068. Impactos: acceso con privilegios elevados (SYSTEM) tras escalada y manipulación de archivos arbitrarios (escritura/eliminación).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Application Developer GuidanceActive Directory ConfigurationUser TrainingUser Account ManagementThreat Intelligence ProgramRestrict File and Directory Permissions

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Quanos — Schema ST4AI

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-11858",
  "cveTags": [],
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          "options": [
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  "lastModified": "2026-06-17T16:21:32.403",
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