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CVE-2026-54365— CentreStack < 17.3 Unauthenticated User Creation via Deserialization in GSNamespace.dll

Quick assessment

Affected
Gladinet CentreStack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Gladinet centrestack是美国Gladinet公司的一个文件同步与协作平台。 Gladinet CentreStack 17.3之前版本存在授权问题漏洞，该漏洞源于GSNamespace.dll存在未经身份验证的反序列化漏洞，可能导致攻击者通过向API端点发送恶意的StorageConfigure参数，触发InternalImportAdUserByUPN()，从而创建任意本地OS用户账户。

CVSS 7.5 · High EPSS 0.22% · P12

Affected Version Matrix 1

VendorProduct Version RangeStatus
Gladinet CentreStack < 17.3 affected
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I. Basic Information for CVE-2026-54365

Vulnerability Information
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Vulnerability Title
CentreStack < 17.3 Unauthenticated User Creation via Deserialization in GSNamespace.dll
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Gladinet CentreStack 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gladinet centrestack是美国Gladinet公司的一个文件同步与协作平台。 Gladinet CentreStack 17.3之前版本存在授权问题漏洞，该漏洞源于GSNamespace.dll存在未经身份验证的反序列化漏洞，可能导致攻击者通过向API端点发送恶意的StorageConfigure参数，触发InternalImportAdUserByUPN()，从而创建任意本地OS用户账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Gladinet CentreStack 0 ~ 17.3 -

II. Public POCs for CVE-2026-54365

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III. Intelligence Information for CVE-2026-54365

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Vendor Advisories for CVE-2026-54365 (1)

Vendor Pages for CVE-2026-54365 (1)

Same Patch Batch · Gladinet · 2026-07-30 · 6 CVEs total

CVE-2026-54363 9.1 CRITICAL CentreStack < 17.5 Hardcoded Key Token Forgery RCE
CVE-2026-54368 8.8 HIGH CentreStack < 17.4 SQL Injection via x-glad-filter Header
CVE-2026-54367 8.6 HIGH CentreStack < 17.2 Unauthenticated API Authorization Bypass
CVE-2026-54366 7.5 HIGH CentreStack < 17.4 XXE via SharePoint Storage Configuration
CVE-2026-54364 6.5 MEDIUM CentreStack < 17.4 Session Injection via SelectProvider.aspx

IV. Related Vulnerabilities

Same product: CentreStack
Same vendor: Gladinet
Same weakness: CWE-306

V. Comments for CVE-2026-54365

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