CVE-2026-54366: CentreStack < 17.4 XXE via SharePoint Storage Configuration

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-30 · updated 2026-07-30
Weakness: CWE-611

Description

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

How to fix

Upgrade to a fixed version: Gladinet CentreStack 17.4. Check the vendor advisory for mitigations.

References

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