CVE-2026-40379

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-12. the CNA's CVSS baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.3Exploit: None knownExposed: 0

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

Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity93% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
58%
KEV
Not listed

Published

May 12, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated Sep 3, 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-2026-40379

Vendor Advisories for CVE-2026-40379(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 6× in last 7d / 117× 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 434 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-40379?
CVE-2026-40379 is a critical vulnerability published on May 12, 2026. Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.
When was CVE-2026-40379 disclosed?
CVE-2026-40379 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40379 actively exploited?
CVE-2026-40379 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 42.4% of all scored CVEs.
What is the CVSS score of CVE-2026-40379?
CVE-2026-40379 has a CVSS v4.0 base score of 9.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-40379?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40379, 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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