CVE-2026-54365 CentreStack < 17.3 Unauthenticated User Creation via Deserialization in GSNamespace.dll
Unauthenticated attackers can create arbitrary local OS user accounts via deserialization in CentreStack, leading to privilege escalation and potential code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54365?
CVE-2026-54365 is a high-severity unsafe deserialization vulnerability in Gladinet CentreStack, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-306
Which versions are affected by CVE-2026-54365?
How do I fix CVE-2026-54365?
No fix has been published for CVE-2026-54365 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-54365 being exploited?
There is no known exploitation of CVE-2026-54365 in the wild and no public exploit code.
Sources
Also known as GHSA-q7f4-j8r5-hmxq.