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Microsoft Security Response CenterCVE-2026-66818

Microsoft SQL Server Elevation of Privilege Vulnerability

Improper privilege management in SQL Server allows an authorized attacker to elevate privileges over a network.

Read the vendor bulletin Get alerts for Microsoft SQL Server 2017 for x64-based Systems (GDR)
8.8CVSS out of 10High severity
Scope

What the vendor says is affected

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

Versions the vendor lists as fixed

  • 14.0.2130.4
  • 15.0.2190.7
  • 14.0.3550.4
  • 16.0.1200.5
  • 17.0.1135.8
  • 15.0.4490.9
  • 16.0.4275.2
  • 17.0.4085.5
Next step

What the vendor recommends

Install KB5122775. Install KB5122773. Install KB5122774. Install KB5122771. Install KB5122770. Install KB5122772. Install KB5122768. Install KB5122769.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-66818View CVSS, KEV, EPSS, and threat context
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