CVE-2026-66802

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. the CNA's CVSS baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Device Health Attestation (DHA) allows an unauthorized attacker to execute code over a network.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

August 11, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Aug 11, 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-2026-66802

Vendor Advisories for CVE-2026-66802(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 38× in last 7d / 188× 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 334 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-66802?
CVE-2026-66802 is a high vulnerability published on August 11, 2026. Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Device Health Attestation (DHA) allows an unauthorized attacker to execute code over a network.
When was CVE-2026-66802 disclosed?
CVE-2026-66802 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66802 actively exploited?
CVE-2026-66802 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 70.2% of all scored CVEs.
What is the CVSS score of CVE-2026-66802?
CVE-2026-66802 has a CVSS v4.0 base score of 8.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-66802?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66802, 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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