CVE-2026-54366

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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 17.4 contains an XML external entity (XXE) injection vulnerability that allows unauthenticated attackers to exfiltrate arbitrary files by supplying a malicious URL to the SharePoint storage configuration handler. Attackers can send a crafted request to the unauthenticated StorageConfig endpoint causing the server to fetch and parse attacker-controlled XML containing external DTD references, resulting in out-of-band file exfiltration of sensitive files such as Web.config, which may contain database credentials and cryptographic key material.

CVSS v3
7.5
EG Score
7.5(high)
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
21%
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 < 17.4 XXE via SharePoint Storage Configuration | Advisories | VulnCheck

https://www.vulncheck.com/advisories/centrestack-xxe-via-sharepoint-storage-configuration
generic

CentreStack: Grow Your MSP with Your Branded File Solution

https://www.centrestack.com/

Vendor Advisories for CVE-2026-54366(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 25× in last 7d / 108× 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 108 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-54366?
CVE-2026-54366 is a high vulnerability published on July 30, 2026. CentreStack before 17.4 contains an XML external entity (XXE) injection vulnerability that allows unauthenticated attackers to exfiltrate arbitrary files by supplying a malicious URL to the SharePoint storage configuration handler. Attackers can send a crafted request to the unauthenticated…
When was CVE-2026-54366 disclosed?
CVE-2026-54366 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-2026-54366 actively exploited?
CVE-2026-54366 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 79.3% of all scored CVEs.
What is the CVSS score of CVE-2026-54366?
CVE-2026-54366 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-54366?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54366, 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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