CVE-2026-54365

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-30. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

July 30, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Jul 30, 2026
No patch confirmed yet.
generic

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

https://www.vulncheck.com/advisories/centrestack-unauthenticated-user-creation-via-deserialization-in-gsnamespace-dll
generic

CentreStack: Grow Your MSP with Your Branded File Solution

https://www.centrestack.com/

Vendor Advisories for CVE-2026-54365(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 110× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 116 total refreshes for this CVE.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 22:37 UTCEG score recompute
  3. 2026-08-29 22:36 UTCGHSA enrichment
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 22:11 UTCEG score recompute
  6. 2026-08-27 22:11 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 09:37 UTCGHSA enrichment
  9. 2026-08-26 21:02 UTCEG score recompute
  10. 2026-08-26 21:01 UTCGHSA enrichment
  11. 2026-08-26 14:46 UTCEPSS rescore
  12. 2026-08-26 07:49 UTCGHSA enrichment
  13. 2026-08-25 19:12 UTCEG score recompute
  14. 2026-08-25 19:12 UTCGHSA enrichment
  15. 2026-08-25 13:49 UTCEPSS rescore
  16. 2026-08-25 06:38 UTCGHSA enrichment
  17. 2026-08-24 17:49 UTCEG score recompute
  18. 2026-08-24 17:49 UTCGHSA enrichment
  19. 2026-08-24 03:41 UTCGHSA enrichment
  20. 2026-08-23 15:06 UTCGHSA enrichment
  21. 2026-08-23 02:31 UTCEG score recompute
  22. 2026-08-23 02:31 UTCGHSA enrichment
  23. 2026-08-23 00:19 UTCEPSS rescore
  24. 2026-08-22 13:56 UTCGHSA enrichment
  25. 2026-08-22 01:21 UTCEG score recompute
Show 75 more
  1. 2026-08-22 01:21 UTCGHSA enrichment
  2. 2026-08-21 23:49 UTCEPSS rescore
  3. 2026-08-21 12:46 UTCGHSA enrichment
  4. 2026-08-21 00:11 UTCEG score recompute
  5. 2026-08-21 00:10 UTCGHSA enrichment
  6. 2026-08-20 22:55 UTCEPSS rescore
  7. 2026-08-20 11:36 UTCGHSA enrichment
  8. 2026-08-19 23:01 UTCEG score recompute
  9. 2026-08-19 23:01 UTCGHSA enrichment
  10. 2026-08-19 17:04 UTCEPSS rescore
  11. 2026-08-19 10:26 UTCGHSA enrichment
  12. 2026-08-18 21:51 UTCEG score recompute
  13. 2026-08-18 21:51 UTCGHSA enrichment
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-18 09:16 UTCGHSA enrichment
  16. 2026-08-17 20:41 UTCEG score recompute
  17. 2026-08-17 20:41 UTCGHSA enrichment
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 08:06 UTCGHSA enrichment
  20. 2026-08-16 19:32 UTCEG score recompute
  21. 2026-08-16 19:32 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 06:56 UTCEG score recompute
  24. 2026-08-16 06:56 UTCGHSA enrichment
  25. 2026-08-16 02:14 UTCEPSS rescore
  26. 2026-08-15 18:22 UTCGHSA enrichment
  27. 2026-08-15 05:47 UTCEG score recompute
  28. 2026-08-15 05:47 UTCGHSA enrichment
  29. 2026-08-15 01:30 UTCEPSS rescore
  30. 2026-08-14 17:12 UTCEG score recompute
  31. 2026-08-14 17:12 UTCGHSA enrichment
  32. 2026-08-14 14:29 UTCGHSA enrichment
  33. 2026-08-14 01:54 UTCEG score recompute
  34. 2026-08-14 01:54 UTCGHSA enrichment
  35. 2026-08-13 22:00 UTCEPSS rescore
  36. 2026-08-13 13:19 UTCGHSA enrichment
  37. 2026-08-13 00:43 UTCEG score recompute
  38. 2026-08-13 00:43 UTCGHSA enrichment
  39. 2026-08-12 13:51 UTCEPSS rescore
  40. 2026-08-12 12:08 UTCGHSA enrichment
  41. 2026-08-11 23:32 UTCEG score recompute
  42. 2026-08-11 23:32 UTCGHSA enrichment
  43. 2026-08-11 10:57 UTCEG score recompute
  44. 2026-08-11 10:57 UTCGHSA enrichment
  45. 2026-08-11 00:00 UTCEPSS rescore
  46. 2026-08-10 22:22 UTCGHSA enrichment
  47. 2026-08-10 09:47 UTCGHSA enrichment
  48. 2026-08-09 21:12 UTCEG score recompute
  49. 2026-08-09 21:12 UTCGHSA enrichment
  50. 2026-08-09 13:46 UTCEPSS rescore
  51. 2026-08-09 08:38 UTCGHSA enrichment
  52. 2026-08-08 20:03 UTCEG score recompute
  53. 2026-08-08 20:03 UTCGHSA enrichment
  54. 2026-08-08 16:37 UTCEPSS rescore
  55. 2026-08-08 07:28 UTCGHSA enrichment
  56. 2026-08-07 18:53 UTCEG score recompute
  57. 2026-08-07 18:53 UTCGHSA enrichment
  58. 2026-08-07 06:18 UTCGHSA enrichment
  59. 2026-08-06 17:43 UTCEG score recompute
  60. 2026-08-06 17:43 UTCGHSA enrichment
  61. 2026-08-06 13:47 UTCEPSS rescore
  62. 2026-08-06 05:08 UTCEG score recompute
  63. 2026-08-06 05:08 UTCGHSA enrichment
  64. 2026-08-05 19:17 UTCEPSS rescore
  65. 2026-08-05 16:33 UTCGHSA enrichment
  66. 2026-08-05 03:58 UTCGHSA enrichment
  67. 2026-08-04 15:23 UTCEG score recompute
  68. 2026-08-04 15:23 UTCGHSA enrichment
  69. 2026-08-04 15:10 UTCEPSS rescore
  70. 2026-08-04 10:39 UTCEPSS rescore
  71. 2026-08-04 02:48 UTCGHSA enrichment
  72. 2026-08-03 14:13 UTCEG score recompute
  73. 2026-08-03 14:13 UTCGHSA enrichment
  74. 2026-08-03 10:36 UTCEPSS rescore
  75. 2026-08-03 01:38 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-54365?
CVE-2026-54365 is a high vulnerability published on July 30, 2026. 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…
When was CVE-2026-54365 disclosed?
CVE-2026-54365 was first published in the National Vulnerability Database on July 30, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54365 actively exploited?
CVE-2026-54365 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 88.1% of all scored CVEs.
What is the CVSS score of CVE-2026-54365?
CVE-2026-54365 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-54365?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54365, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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