What is CVE-2026-66816?

CVE-2026-66816 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft SQL Server Security Feature Bypass Vulnerability

Which CVE IDs does CVE-2026-66816 cover?

CVE-2026-66816 covers the following CVE IDs: CVE-2026-66816. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-66816?

CVE-2026-66816 has a CVSS v3 base score of 6.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-66816?

CVE-2026-66816 affects 4 products, including: Microsoft SQL Server 2022 for x64-based Systems (CU 26); Microsoft SQL Server 2022 for x64-based Systems (GDR); Microsoft SQL Server 2025 for x64-based Systems (CU8); Microsoft SQL Server 2025 for x64-based Systems (GDR).

CVE-2026-66816HighCVSS 6.5

Microsoft SQL Server Security Feature Bypass Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

September 11, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-66816 →

📋 Description

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

🎯 Affected products4

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

✅ Remediation

KB5122771 (Security Update) — fixed build 16.0.1200.5 KB5122770 (Security Update) — fixed build 17.0.1135.8 KB5122769 (Security Update) — fixed build 17.0.4085.5 KB5122768 (Security Update) — fixed build 16.0.4275.2

🔗 References (9)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66816
patchhttps://www.microsoft.com/download/details.aspx?familyid=7ce0ba48-9a1e-4298-b300-79f251385092
referencehttps://support.microsoft.com/help/5122771
patchhttps://www.microsoft.com/download/details.aspx?familyid=0d644af6-717c-45d7-bf71-ce7e309d2ad7
referencehttps://support.microsoft.com/help/5122770
patchhttps://www.microsoft.com/download/details.aspx?familyid=65b5f47b-53bf-4b54-89e7-6aefaad8dc51
referencehttps://support.microsoft.com/help/5122769
patchhttps://www.microsoft.com/download/details.aspx?familyid=d682ec86-56e1-45c3-a0fa-552f89f6e51e
referencehttps://support.microsoft.com/help/5122768