CVE-2026-54365

CentreStack before 17.3 contains an unauthenticated deserialization vulnerability in GSNamespace.dll that allows unauthenticated attackers to create arbitrary local OS user accounts by supplying a crafted base64-encoded XML string to exposed API endpoints. Attackers can send a malicious StorageConfigure parameter to the jsonimportuserbyupn, jsonimportuserbyupnex, or japiimportuserbyupn endpoints to trigger InternalImportAdUserByUPN(), causing GladinetCloudMonitor.exe to invoke the NetUserAdd Windows API with attacker-controlled credentials and create arbitrary directories on the server filesystem.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://www.centrestack.com/
https://www.vulncheck.com/advisories/centrestack-unauthenticated-user-creation-via-deserialization-in-gsnamespace-dll

Configurations

No configuration.

History

23 Oct 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) CentreStack anterior a 17.3 contiene una vulnerabilidad de deserialización no autenticada en GSNamespace.dll que permite a atacantes no autenticados crear cuentas de usuario arbitrarias del sistema operativo local al proporcionar una cadena XML codificada en base64 maliciosa a puntos finales de la API expuestos. Los atacantes pueden enviar un parámetro StorageConfigure malicioso a los puntos finales jsonimportuserbyupn, jsonimportuserbyupnex o japiimportuserbyupn para activar InternalImportAdUserByUPN(), lo que hace que GladinetCloudMonitor.exe invoque la API de Windows NetUserAdd con credenciales controladas por el atacante y cree directorios arbitrarios en el sistema de archivos del servidor.

Information

Published : 2026-07-30 13:16

Updated : 2026-10-23 22:10

NVD link : CVE-2026-54365

Mitre link : CVE-2026-54365

CVE.ORG link : CVE-2026-54365

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

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