# CVE-2026-54366: Gladinet CentreStack XXE in SharePoint storage configuration handler

Source: https://junglewise.ai/threats/cve-2026-54366-gladinet-centrestack-xxe-in-sharepoint-storage-configuration  
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-2026-54366 · Severity: high · CVSS 7.5 · Published 2026-07-30

CentreStack, a file-sharing and remote access platform for managed service providers, contains a security flaw in its SharePoint storage configuration handler. An unauthenticated attacker can exploit this to remotely steal sensitive files from the server, such as configuration files containing database credentials or encryption keys. This could lead to a total compromise of the server and the data it manages for various clients.

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

## Quick answers

**Is CVE-2026-54366 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-54366 being exploited in the wild.

**How severe is CVE-2026-54366?** High severity, with a CVSS score of 7.5, published 30 July 2026.

**Which products and versions are affected?** Gladinet CentreStack before 17.4.

**Is there a fix for CVE-2026-54366?** 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-2026-54366 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-54366?** 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 XML External Entity (XXE) injection vulnerability exists in CentreStack versions prior to 17.4 within the SharePoint storage configuration handler. The vulnerability is located in the unauthenticated StorageConfig endpoint, which fails to properly restrict XML external entity references. An attacker can send a crafted request containing a malicious URL, forcing the server to fetch and parse attacker-controlled XML with external DTD references. This allows for out-of-band (OOB) exfiltration of sensitive local files, such as Web.config, which may contain database credentials and cryptographic keys. The issue is resolved in version 17.4.

## Affected products

- Gladinet CentreStack before 17.4

## Timeline

- 2026-07-30: disclosed
- 2026-07-30: advisory

## References

- [https://www.centrestack.com/](https://www.centrestack.com/)
- [https://www.vulncheck.com/advisories/centrestack-xxe-via-sharepoint-storage-configuration](https://www.vulncheck.com/advisories/centrestack-xxe-via-sharepoint-storage-configuration)

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