CVE-2026-40404

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Jun 9, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40404

Vendor Advisories for CVE-2026-40404(2)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 107× 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 192 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-40404?
CVE-2026-40404 is a high vulnerability published on June 9, 2026. Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
When was CVE-2026-40404 disclosed?
CVE-2026-40404 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40404 actively exploited?
CVE-2026-40404 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 73.6% of all scored CVEs.
What is the CVSS score of CVE-2026-40404?
CVE-2026-40404 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-40404?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40404, 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

Explore the affected products and dependency analysis for CVE-2026-40404

Explore →

Is Your Infrastructure Affected by CVE-2026-40404?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs