Auth bypass in Gladinet Centrestack
CVE-2026-54365
CentreStack before 17.3 contains an unauthenticated deserialization vulnerability in GSNamespace.dll that allows unauthenticated attackers to create arbitrary local OS user accounts by supplying a crafted base64-encoded XML string to exposed API endpoints. Attackers can send a malicious StorageConfigure parameter to the jsonimportuserbyupn, jsonimportuserbyupnex, or japiimportuserbyupn endpoints to trigger InternalImportAdUserByUPN(), causing GladinetCloudMonitor.exe to invoke the NetUserAdd Windows API with attacker-controlled credentials and create arbitrary directories on the server filesystem.
Vulnerability class: Broken Authentication
EPSS: 0.002 (12.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Gladinet Centrestack — versions 0
Weakness classification (CWE)
References
- Product Homepage (product)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-54365?
- CVE-2026-54365 is a high-severity vulnerability in Gladinet Centrestack, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-07-30.
- How severe is CVE-2026-54365?
- High severity. CVSS v3 base score is 7.5 out of 10.