CVE-2026-54365

HIGH 7.5

CentreStack < 17.3 Unauthenticated User Creation via Deserialization in GSNamespace.dll

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-306
Vendor	gladinet
Product	centrestack
Published	Jul 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

Gladinet / CentreStack

0 < 17.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

PeterV @cfc security ltd