Vulnerabilities / CVE-2026-54365

CVE-2026-54365

Published 2026-07-30 · published (not yet in NVD)

CVE-2026-54365

CentreStack < 17.3 Unauthenticated User Creation via Deserialization in GSNamespace.dll

8.7 HIGH
CVSS 4.0 · CNA

0.4%
chance of exploitation in the next 30 days (EPSS; higher than 31% of CVEs)

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.

Scores

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NCNA

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NCNA

Affected products

Gladinet CentreStack: < 17.3

Weakness: CWE-306

2 references (advisories, patches, write-ups)

https://www.centrestack.com/ · product
https://www.vulncheck.com/advisories/centrestack-unauthenticated-user-creation-via-deserialization-in-gsnamespace-dll · third-party-advisory

Sources: CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.

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