CVE-2026-66816

Microsoft SQL Server Security Feature Bypass Vulnerability

CVE-2026-66816 is fixed in 4 products on 1 platform, first by KB5122768, released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0100

62nd percentile

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

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft SQL Server 2022 for x64-based Systems (CU 26)	KB5122768	Sep 8, 2026
Microsoft SQL Server 2022 for x64-based Systems (GDR)	KB5122771	Sep 8, 2026
Microsoft SQL Server 2025 for x64-based Systems (CU8)	KB5122769	Sep 8, 2026
Microsoft SQL Server 2025 for x64-based Systems (GDR)	KB5122770	Sep 8, 2026

Details

Published
September 8, 2026
Weakness
Insufficient Logging
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66816

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