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Fencer Vulns
high 8.8

CVE-2026-66814 json

Microsoft SQL Server Elevation of Privilege Vulnerability

published 2026-09-08 2 mo ago modified 2026-10-31 8 d ago also EUVD-2026-73375

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

Insufficient granularity of access control in SQL Server allows an authorized attacker to elevate privileges over a network.

Patch / fix

  • Microsoft Microsoft SQL Server 2017 (CU 31) 14.0.3550.4
  • Microsoft Microsoft SQL Server 2017 (GDR) 14.0.2130.4
  • Microsoft Microsoft SQL Server 2019 (CU 32) 15.0.4490.9
  • Microsoft Microsoft SQL Server 2019 (GDR) 15.0.2190.7
  • Microsoft Microsoft SQL Server 2022 (CU 26) 16.0.4275.2
  • Microsoft Microsoft SQL Server 2022 (GDR) 16.0.1200.5
  • Microsoft Microsoft SQL Server 2025 (CU8) 17.0.4085.5
  • Microsoft Microsoft SQL Server 2025 for x64-based Systems (GDR) 17.0.1135.8

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Microsoft SQL Server 2017 (CU 31)
  • Microsoft Microsoft SQL Server 2017 (GDR)
  • Microsoft Microsoft SQL Server 2019 (CU 32)
  • Microsoft Microsoft SQL Server 2019 (GDR)
  • Microsoft Microsoft SQL Server 2022 (CU 26)
  • Microsoft Microsoft SQL Server 2022 (GDR)
  • Microsoft Microsoft SQL Server 2025 (CU8)
  • Microsoft Microsoft SQL Server 2025 for x64-based Systems (GDR)

Classification

Weakness
  • CWE-1220 Insufficient Granularity of Access Control
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.