CVE-2026-54366: Gladinet CentreStack

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

CentreStack before 17.4 contains an XML external entity (XXE) injection vulnerability that allows unauthenticated attackers to exfiltrate arbitrary files by supplying a malicious URL to the SharePoint storage configuration handler. Attackers can send a crafted request to the unauthenticated StorageConfig endpoint causing the server to fetch and parse attacker-controlled XML containing external DTD references, resulting in out-of-band file exfiltration of sensitive files such as Web.config, which may contain database credentials and cryptographic key material.

Affected products

• Gladinet CentreStack: before 17.4 (fixed in 17.4)

Published 2026-07-30. Last modified 2026-07-30.