CVE-2026-54366

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 30, 2026

Last Modified

August 14, 2026

Advisory Details (2)

Auto-updated Jul 30, 2026
No fix on record yet.
Web page

CentreStack < 17.4 XXE via SharePoint Storage Configuration | Advisories | VulnCheck

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

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 14× in last 7d / 74× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 226 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 126 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:39 UTCEG score recompute
  2. 2026-10-11 16:54 UTCEG score recompute
  3. 2026-10-11 14:18 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  7. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  9. 2026-10-06 23:53 UTCEG score recompute
  10. 2026-10-06 23:53 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  11. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-10-05 20:01 UTCEG score recompute
  13. 2026-10-05 20:01 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-10-04 23:58 UTCEG score recompute
  16. 2026-10-04 23:58 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-10-04 06:39 UTCEG score recompute
  19. 2026-10-04 06:39 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-10-02 16:59 UTCEG score recompute
  23. 2026-10-02 16:59 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  24. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-10-01 15:42 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
Show 75 more
  1. 2026-10-01 03:07 UTCEG score recompute
  2. 2026-10-01 03:07 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  3. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  5. 2026-09-29 06:54 UTCEG score recompute
  6. 2026-09-29 06:54 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-09-28 07:32 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-09-27 19:02 UTCEG score recompute
  10. 2026-09-27 19:02 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  11. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  13. 2026-09-25 04:57 UTCEG score recompute
  14. 2026-09-25 04:57 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  15. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-09-24 10:00 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  17. 2026-09-23 21:31 UTCEG score recompute
  18. 2026-09-23 21:31 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  19. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  20. 2026-09-23 03:45 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  21. 2026-09-22 15:15 UTCEG score recompute
  22. 2026-09-22 15:15 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  23. 2026-09-20 21:25 UTCEG score recompute
  24. 2026-09-20 21:25 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  25. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  26. 2026-09-19 23:48 UTCEG score recompute
  27. 2026-09-19 23:48 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  28. 2026-09-19 04:17 UTCEG score recompute
  29. 2026-09-19 04:17 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  30. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  31. 2026-09-18 14:54 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  32. 2026-09-18 01:23 UTCEG score recompute
  33. 2026-09-18 01:23 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  34. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  35. 2026-09-17 01:29 UTCEG score recompute
  36. 2026-09-17 01:29 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  37. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  38. 2026-09-16 05:36 UTCEG score recompute
  39. 2026-09-16 05:36 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  40. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  41. 2026-09-15 03:21 UTCEG score recompute
  42. 2026-09-15 03:21 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  43. 2026-09-14 10:56 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-09-13 22:26 UTCEG score recompute
  45. 2026-09-13 22:26 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  46. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  47. 2026-09-13 09:57 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  48. 2026-09-12 21:27 UTCEG score recompute
  49. 2026-09-12 21:27 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  50. 2026-09-12 08:57 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  51. 2026-09-11 20:25 UTCEG score recompute
  52. 2026-09-11 20:25 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  53. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  54. 2026-09-11 07:38 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-09-10 19:08 UTCEG score recompute
  56. 2026-09-10 19:08 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  57. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  58. 2026-09-10 03:35 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  59. 2026-09-09 07:17 UTCEG score recompute
  60. 2026-09-09 07:17 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  61. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  62. 2026-09-07 20:02 UTCEG score recompute
  63. 2026-09-07 20:02 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  65. 2026-09-06 20:56 UTCEG score recompute
  66. 2026-09-06 20:56 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  68. 2026-09-06 07:20 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  69. 2026-09-05 18:50 UTCEG score recompute
  70. 2026-09-05 18:50 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  71. 2026-09-05 04:55 UTCEG score recompute
  72. 2026-09-05 04:55 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  73. 2026-09-04 11:28 UTCEG score recompute
  74. 2026-09-04 11:28 UTCGHSA enrichmentGHSA-m68w-g32j-mw5x · GitHub severity HIGH · GitHub CVSS 7.5
  75. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 20th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54366?
CVE-2026-54366 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-54366 was made public on July 28, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on July 30, 2026. EchelonGraph's copy of the record carries a last-modified date of August 14, 2026; the record at its source may have been updated since.
Is CVE-2026-54366 actively exploited?
CVE-2026-54366 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54366?
CVE-2026-54366 has a CVSS base score of 7.5 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-54366?
No fix for CVE-2026-54366 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-54366 are linked in the Vendor Advisories panel on this page.

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