High severity · published Jul 30, 2026
CVE-2026-54365
CentreStack < 17.3 Unauthenticated User Creation via Deserialization in GSNamespace.dll
7.5
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CE
CentreStack · Gladinet
before 17.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54365
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-54365
www.centrestack.com
https://www.centrestack.com/
www.vulncheck.com
https://www.vulncheck.com/advisories/centrestack-unauthenticated-user-creation-via-deserialization-in-gsnamespace-dll
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