CVE-2026-54365: Missing Authentication for Critical Function in Gladinet CentreStack
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.
AI Analysis
Technical Summary
CVE-2026-54365 is an unauthenticated deserialization vulnerability affecting Gladinet CentreStack before version 17.3. The vulnerability resides in GSNamespace.dll, where attackers can supply a crafted base64-encoded XML string to exposed API endpoints (jsonimportuserbyupn, jsonimportuserbyupnex, japiimportuserbyupn). This input triggers the InternalImportAdUserByUPN() function, causing GladinetCloudMonitor.exe to invoke the NetUserAdd Windows API with attacker-controlled data, enabling creation of arbitrary local OS user accounts and directories on the server filesystem without authentication.
Potential Impact
Successful exploitation allows unauthenticated attackers to create arbitrary local user accounts on the affected system, potentially enabling privilege escalation or persistent access. Additionally, attackers can create arbitrary directories on the server filesystem, which may facilitate further malicious activity. The vulnerability has a CVSS 4.0 base score of 8.7 (high severity), indicating a significant security risk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is indicated in the available data. Until a patch is available, restrict access to the affected API endpoints and monitor for suspicious activity related to user account creation.
CVE-2026-54365: Missing Authentication for Critical Function in Gladinet CentreStack
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.
CVSS v4.0
Score 8.7high
Affected software
Gladinet
CentreStack
pkg:github/gladinet/centrestackRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-54365 is an unauthenticated deserialization vulnerability affecting Gladinet CentreStack before version 17.3. The vulnerability resides in GSNamespace.dll, where attackers can supply a crafted base64-encoded XML string to exposed API endpoints (jsonimportuserbyupn, jsonimportuserbyupnex, japiimportuserbyupn). This input triggers the InternalImportAdUserByUPN() function, causing GladinetCloudMonitor.exe to invoke the NetUserAdd Windows API with attacker-controlled data, enabling creation of arbitrary local OS user accounts and directories on the server filesystem without authentication.
Potential Impact
Successful exploitation allows unauthenticated attackers to create arbitrary local user accounts on the affected system, potentially enabling privilege escalation or persistent access. Additionally, attackers can create arbitrary directories on the server filesystem, which may facilitate further malicious activity. The vulnerability has a CVSS 4.0 base score of 8.7 (high severity), indicating a significant security risk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is indicated in the available data. Until a patch is available, restrict access to the affected API endpoints and monitor for suspicious activity related to user account creation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-12T20:20:02.947Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a6b49199c2644c7f816bfce
Added to database: 07/30/2026, 12:52:41 UTC
Last enriched: 08/15/2026, 13:46:27 UTC
Last updated: 09/13/2026, 22:01:35 UTC
Views: 63
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