CVE-2026-66309

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-21. The CNA's CVSS baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper access control in Azure SQL Database allows an authorized attacker to elevate privileges over a network.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
41
EG Risk 41/100CISA 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
Severity91% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.9%
EPSS %ILE
57th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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

August 20, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Sep 15, 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-2026-66309

Vendor Advisories for CVE-2026-66309(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 70× in last 7d / 333× 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 561 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-66309?
CVE-2026-66309 is a critical vulnerability published on August 20, 2026. Improper access control in Azure SQL Database allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-66309 disclosed?
CVE-2026-66309 was first published on August 20, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66309 actively exploited?
CVE-2026-66309 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (57th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66309?
CVE-2026-66309 has a CVSS base score of 9.1 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-66309?
A fix for CVE-2026-66309 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66309 are linked in the Vendor Advisories panel on this page.

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