CVE-2026-54365

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductCentreStack

PublishedJul 30, 2026

First seenJul 30, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Update

Gladinet CentreStack17.3 or later

Affected products

Product	Affected versions	Fixed in
Gladinet CentreStack	v < 17.3	17.3

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