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CVE-2026-54365 is an unauthenticated deserialization vulnerability in Gladinet CentreStack before version 17.3. The flaw resides in GSNamespace.dll and is reachable through exposed API endpoints that accept a crafted base64-encoded XML value in the StorageConfigure parameter. Supplying malicious serialized input to the affected import-user endpoints can trigger InternalImportAdUserByUPN(), leading GladinetCloudMonitor.exe to invoke the Windows NetUserAdd API with attacker-controlled credentials. As a result, a remote unauthenticated attacker can create arbitrary local operating system user accounts and arbitrary directories on the server filesystem.
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No public exploit code observed for this vulnerability.
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An unauthenticated deserialization flaw in Gladinet CentreStack that allows attackers to create arbitrary local OS user accounts via crafted API requests, establishing a foothold on the system.
An unauthenticated deserialization vulnerability in Gladinet CentreStack GSNamespace.dll that allows remote unauthenticated attackers to create arbitrary local OS user accounts via crafted requests to exposed API endpoints.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.