Executive brief
CentreStack is a file-sharing and management platform used by service providers to offer secure remote access to corporate data. A security flaw allows an unauthenticated attacker to remotely create new administrator-level user accounts on the underlying Windows server. This could lead to a complete takeover of the server, unauthorized access to sensitive files, and disruption of business operations.
Technical details
An unauthenticated deserialization vulnerability exists in the GSNamespace.dll component of Gladinet CentreStack. By sending a specially crafted base64-encoded XML string via the 'StorageConfigure' parameter to the 'jsonimportuserbyupn', 'jsonimportuserbyupnex', or 'japiimportuserbyupn' API endpoints, an attacker can trigger the InternalImportAdUserByUPN() function. This causes the GladinetCloudMonitor.exe process to call the Windows NetUserAdd API with attacker-supplied credentials, resulting in the creation of arbitrary local OS user accounts and directories. The vulnerability is addressed in version 17.3.
Affected products
- Gladinet CentreStack before 17.3
Timeline
- 2026-07-30: disclosed: Vulnerability disclosed by VulnCheck
- 2026-07-30: advisory: NVD record published