CVE-2026-54365 (GCVE-0-2026-54365)

Vulnerability from cvelistv5 – Published: 2026-07-30 12:25 – Updated: 2026-07-30 12:25
VLAI
Title
CentreStack < 17.3 Unauthenticated User Creation via Deserialization in GSNamespace.dll
Summary
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.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
References
Impacted products
Vendor Product Version
Gladinet CentreStack Affected: 0 , < 17.3 (custom)
Create a notification for this product.
Date Public
2026-07-28 00:00
Credits
PeterV @cfc security ltd
Show details on NVD website
To clipboard 

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        }
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            "Recovery": "NOT_DEFINED",
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      "source": {
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    "datePublished": "2026-07-30T12:25:05.528Z",
    "dateReserved": "2026-06-12T20:20:02.947Z",
    "dateUpdated": "2026-07-30T12:25:05.528Z",
    "state": "PUBLISHED"
  },
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.