CVE-2026-40404

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 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(high)
EPSS
25.8%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 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 41× in last 7d / 180× 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 180 total refreshes for this CVE.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 03:52 UTCEG score recompute
  4. 2026-07-06 03:52 UTCVendor advisory
  5. 2026-07-06 03:52 UTCGHSA enrichment
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-05 15:11 UTCEG score recompute
  9. 2026-07-05 15:11 UTCVendor advisory
  10. 2026-07-05 15:11 UTCGHSA enrichment
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-05 02:16 UTCEG score recompute
  13. 2026-07-05 02:16 UTCVendor advisory
  14. 2026-07-05 02:15 UTCGHSA enrichment
  15. 2026-07-04 13:23 UTCEG score recompute
  16. 2026-07-04 13:23 UTCVendor advisory
  17. 2026-07-04 13:23 UTCGHSA enrichment
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-03 21:06 UTCEG score recompute
  20. 2026-07-03 21:06 UTCVendor advisory
  21. 2026-07-03 21:06 UTCGHSA enrichment
  22. 2026-07-03 08:46 UTCEG score recompute
  23. 2026-07-03 08:46 UTCVendor advisory
  24. 2026-07-03 08:46 UTCGHSA enrichment
  25. 2026-07-02 16:22 UTCEG score recompute
Show 75 more
  1. 2026-07-02 16:22 UTCVendor advisory
  2. 2026-07-02 16:22 UTCGHSA enrichment
  3. 2026-07-02 04:03 UTCEG score recompute
  4. 2026-07-02 04:03 UTCVendor advisory
  5. 2026-07-02 04:02 UTCGHSA enrichment
  6. 2026-07-01 15:44 UTCEG score recompute
  7. 2026-07-01 15:44 UTCVendor advisory
  8. 2026-07-01 15:44 UTCGHSA enrichment
  9. 2026-07-01 15:06 UTCEPSS rescore
  10. 2026-07-01 03:24 UTCEG score recompute
  11. 2026-07-01 03:24 UTCVendor advisory
  12. 2026-07-01 03:24 UTCGHSA enrichment
  13. 2026-06-30 23:22 UTCEPSS rescore
  14. 2026-06-30 15:05 UTCEG score recompute
  15. 2026-06-30 15:05 UTCVendor advisory
  16. 2026-06-30 15:05 UTCGHSA enrichment
  17. 2026-06-30 02:45 UTCEG score recompute
  18. 2026-06-30 02:45 UTCVendor advisory
  19. 2026-06-30 02:45 UTCGHSA enrichment
  20. 2026-06-29 14:26 UTCEG score recompute
  21. 2026-06-29 14:26 UTCVendor advisory
  22. 2026-06-29 14:26 UTCGHSA enrichment
  23. 2026-06-29 14:06 UTCEPSS rescore
  24. 2026-06-29 02:06 UTCEG score recompute
  25. 2026-06-29 02:06 UTCVendor advisory
  26. 2026-06-29 02:06 UTCGHSA enrichment
  27. 2026-06-28 14:07 UTCEPSS rescore
  28. 2026-06-28 13:47 UTCEG score recompute
  29. 2026-06-28 13:47 UTCVendor advisory
  30. 2026-06-28 13:47 UTCGHSA enrichment
  31. 2026-06-28 04:56 UTCEPSS rescore
  32. 2026-06-28 01:29 UTCEG score recompute
  33. 2026-06-28 01:29 UTCVendor advisory
  34. 2026-06-28 01:29 UTCGHSA enrichment
  35. 2026-06-27 13:10 UTCEG score recompute
  36. 2026-06-27 13:10 UTCVendor advisory
  37. 2026-06-27 13:10 UTCGHSA enrichment
  38. 2026-06-27 03:08 UTCEPSS rescore
  39. 2026-06-27 00:51 UTCEG score recompute
  40. 2026-06-27 00:51 UTCVendor advisory
  41. 2026-06-27 00:51 UTCGHSA enrichment
  42. 2026-06-26 12:32 UTCEG score recompute
  43. 2026-06-26 12:32 UTCVendor advisory
  44. 2026-06-26 12:32 UTCGHSA enrichment
  45. 2026-06-26 00:04 UTCEG score recompute
  46. 2026-06-26 00:03 UTCVendor advisory
  47. 2026-06-26 00:03 UTCGHSA enrichment
  48. 2026-06-25 13:49 UTCEPSS rescore
  49. 2026-06-25 13:49 UTCEPSS rescore
  50. 2026-06-25 11:37 UTCEG score recompute
  51. 2026-06-25 11:37 UTCVendor advisory
  52. 2026-06-25 11:37 UTCGHSA enrichment
  53. 2026-06-24 23:15 UTCEG score recompute
  54. 2026-06-24 23:15 UTCVendor advisory
  55. 2026-06-24 23:15 UTCGHSA enrichment
  56. 2026-06-24 14:05 UTCEPSS rescore
  57. 2026-06-24 10:57 UTCEG score recompute
  58. 2026-06-24 10:57 UTCVendor advisory
  59. 2026-06-24 10:56 UTCGHSA enrichment
  60. 2026-06-23 22:35 UTCEG score recompute
  61. 2026-06-23 22:35 UTCVendor advisory
  62. 2026-06-23 22:35 UTCGHSA enrichment
  63. 2026-06-23 21:33 UTCEPSS rescore
  64. 2026-06-23 10:02 UTCEG score recompute
  65. 2026-06-23 10:02 UTCVendor advisory
  66. 2026-06-23 10:02 UTCGHSA enrichment
  67. 2026-06-22 20:41 UTCEG score recompute
  68. 2026-06-22 20:41 UTCVendor advisory
  69. 2026-06-22 20:41 UTCGHSA enrichment
  70. 2026-06-22 14:25 UTCEPSS rescore
  71. 2026-06-22 14:25 UTCEPSS rescore
  72. 2026-06-22 04:52 UTCEG score recompute
  73. 2026-06-22 04:52 UTCVendor advisory
  74. 2026-06-22 04:52 UTCGHSA enrichment
  75. 2026-06-21 14:56 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 1, 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 25.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40404?
CVE-2026-40404 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
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

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