CVE-2026-66816

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-08. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

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

Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
30(Track)
EG Risk 30/100SSVC: 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
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 8, 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-2026-66816

Vendor Advisories for CVE-2026-66816(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 33× in last 7d / 56× 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.

  1. 2026-09-18 21:06 UTCEG score recompute
  2. 2026-09-18 21:06 UTCVendor advisory
  3. 2026-09-18 21:05 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 14:12 UTCVendor advisory
  6. 2026-09-18 14:12 UTCGHSA enrichment
  7. 2026-09-17 23:06 UTCVendor advisory
  8. 2026-09-17 23:06 UTCGHSA enrichment
  9. 2026-09-17 19:55 UTCEG score recompute
  10. 2026-09-17 19:55 UTCVendor advisory
  11. 2026-09-17 19:55 UTCGHSA enrichment
  12. 2026-09-16 22:12 UTCEG score recompute
  13. 2026-09-16 22:12 UTCVendor advisory
  14. 2026-09-16 22:12 UTCGHSA enrichment
  15. 2026-09-16 14:08 UTCEPSS rescore
  16. 2026-09-16 12:02 UTCEG score recompute
  17. 2026-09-16 12:02 UTCVendor advisory
  18. 2026-09-16 12:01 UTCGHSA enrichment
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-15 22:47 UTCVendor advisory
  21. 2026-09-15 22:47 UTCGHSA enrichment
  22. 2026-09-15 17:58 UTCEG score recompute
  23. 2026-09-15 17:58 UTCVendor advisory
  24. 2026-09-15 17:58 UTCGHSA enrichment
  25. 2026-09-14 22:56 UTCVendor advisory
Show 31 more
  1. 2026-09-14 22:56 UTCGHSA enrichment
  2. 2026-09-14 17:48 UTCVendor advisory
  3. 2026-09-14 17:48 UTCGHSA enrichment
  4. 2026-09-14 02:32 UTCVendor advisory
  5. 2026-09-14 02:32 UTCGHSA enrichment
  6. 2026-09-13 00:45 UTCEG score recompute
  7. 2026-09-13 00:45 UTCVendor advisory
  8. 2026-09-13 00:45 UTCGHSA enrichment
  9. 2026-09-11 22:58 UTCVendor advisory
  10. 2026-09-11 22:58 UTCGHSA enrichment
  11. 2026-09-11 20:06 UTCVendor advisory
  12. 2026-09-11 20:06 UTCGHSA enrichment
  13. 2026-09-11 17:02 UTCEG score recompute
  14. 2026-09-11 17:02 UTCVendor advisory
  15. 2026-09-11 17:02 UTCGHSA enrichment
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-11 09:37 UTCEPSS rescore
  18. 2026-09-10 23:37 UTCEG score recompute
  19. 2026-09-10 23:37 UTCGHSA enrichment
  20. 2026-09-09 22:16 UTCGHSA enrichment
  21. 2026-09-09 20:07 UTCVendor advisory
  22. 2026-09-09 20:07 UTCGHSA enrichment
  23. 2026-09-09 00:08 UTCEG score recompute
  24. 2026-09-09 00:08 UTCVendor advisory
  25. 2026-09-09 00:08 UTCGHSA enrichment
  26. 2026-09-08 19:42 UTCGHSA enrichment
  27. 2026-09-08 18:57 UTCEG score recompute
  28. 2026-09-08 18:57 UTCGHSA enrichment
  29. 2026-09-08 17:54 UTCEG score recompute
  30. 2026-09-08 17:54 UTCVendor advisory
  31. 2026-09-08 17:25 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-66816?
CVE-2026-66816 is a medium vulnerability published on September 8, 2026. Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.
When was CVE-2026-66816 disclosed?
CVE-2026-66816 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66816 actively exploited?
CVE-2026-66816 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 47.8% of all scored CVEs.
What is the CVSS score of CVE-2026-66816?
CVE-2026-66816 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-66816?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66816, 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-2026-66816

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