CVE-2026-83501

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-09-08. The CNA's CVSS baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Out-of-bounds read in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.

CVSS v3
5.5
EG Score
5.5MEDIUMhigh confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
32nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 8, 2026

Last Modified

October 1, 2026

Advisory Details (1)

Auto-updated Sep 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-2026-83501

Vendor Advisories for CVE-2026-83501(2)

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 28× in last 7d / 137× 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 137 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-83501?
CVE-2026-83501 is a medium vulnerability published on September 8, 2026. Out-of-bounds read in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.
When was CVE-2026-83501 disclosed?
CVE-2026-83501 was first published on September 8, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-83501 actively exploited?
CVE-2026-83501 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-83501?
CVE-2026-83501 has a CVSS base score of 5.5 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-83501?
A fix for CVE-2026-83501 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-83501 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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