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Microsoft Security Response CenterCVE-2026-66816

Microsoft SQL Server Security Feature Bypass Vulnerability

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

Read the vendor bulletin Get alerts for Microsoft SQL Server 2022 for x64-based Systems (GDR)
6.5CVSS out of 10High severity
Scope

What the vendor says is affected

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

Versions the vendor lists as fixed

  • 16.0.1200.5
  • 17.0.1135.8
  • 17.0.4085.5
  • 16.0.4275.2
Next step

What the vendor recommends

Install KB5122771. Install KB5122770. Install KB5122769. Install KB5122768.

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-2026-66816View CVSS, KEV, EPSS, and threat context
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