What is CVE-2026-66816?

CVE-2026-66816 is a medium-severity vulnerability in Microsoft SQL Server 2022 (Cu 26), classified under CWE-778. CVSS score: 6.5/10. Published 2026-09-08.

How severe is CVE-2026-66816?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Microsoft SQL Server 2022 (Cu 26)

CVE-2026-66816

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Microsoft Sql Server 2022 (Cu 26)
Microsoft Sql Server 2022 (Gdr)
Microsoft Sql Server 2025 (Cu8)
Microsoft Sql Server 2025 For X64-based Systems (Gdr)

Weakness classification (CWE)

CWE-778

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-66816?: CVE-2026-66816 is a medium-severity vulnerability in Microsoft SQL Server 2022 (Cu 26), classified under CWE-778. CVSS score: 6.5/10. Published 2026-09-08.
How severe is CVE-2026-66816?: Medium severity. CVSS v3 base score is 6.5 out of 10.