# CVE-2026-54365: Gladinet CentreStack unauthenticated deserialization in GSNamespace.dll

Source: https://junglewise.ai/threats/cve-2026-54365-gladinet-centrestack-unauthenticated-deserialization-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-30. Updated: 2026-07-30  
License: CC BY 4.0 with a link back

CVE-2026-54365 · Severity: high · CVSS 7.5 · Published 2026-07-30

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.

Technologies: [Gladinet CentreStack](https://junglewise.ai/threats/technologies/centrestack). Vendors: [Gladinet](https://junglewise.ai/threats/vendors/gladinet).

## Quick answers

**Is CVE-2026-54365 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54365 being exploited in the wild.

**How severe is CVE-2026-54365?** High severity, with a CVSS score of 7.5, published 30 July 2026.

**Which products and versions are affected?** Gladinet CentreStack before 17.3.

**Is there a fix for CVE-2026-54365?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-54365 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-54365?** Check whether you run Gladinet CentreStack at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## 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

## References

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

## Related threats

- [Gladinet CentreStack SQL injection in jsondir API x-glad-filter header](https://junglewise.ai/threats/cve-2026-54368-gladinet-centrestack-sql-injection-in-jsondir-api-x-glad-filter)
- [Gladinet CentreStack auth bypass in API endpoints](https://junglewise.ai/threats/cve-2026-54367-gladinet-centrestack-auth-bypass-in-api-endpoints)
- [Gladinet CentreStack XXE in SharePoint storage configuration handler](https://junglewise.ai/threats/cve-2026-54366-gladinet-centrestack-xxe-in-sharepoint-storage-configuration)
- [Gladinet CentreStack session variable injection in SelectProvider.aspx](https://junglewise.ai/threats/cve-2026-54364-gladinet-centrestack-session-variable-injection-in-selectprovider)
- [Gladinet CentreStack hardcoded cryptographic key in AccessTicket](https://junglewise.ai/threats/cve-2026-54363-gladinet-centrestack-hardcoded-cryptographic-key-in-accessticket)