CVE-2026-66816

Microsoft SQL Server Security Feature Bypass Vulnerability

State: Published
Severity: 6.5 Medium
Published: Sep 8, 2026
Updated: Oct 31, 2026
Reserved: Jul 27, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-778 Insufficient Logging

Affected Products

Product	Versions
Microsoft SQL Server 2022 (CU 26)Microsoft	16.0.0.0 to before 16.0.4275.2Affected
Microsoft SQL Server 2022 (GDR)Microsoft	16.0.0 to before 16.0.1200.5Affected
Microsoft SQL Server 2025 (CU8)Microsoft	17.0.0.0 to before 17.0.4085.5Affected
Microsoft SQL Server 2025 for x64-based Systems (GDR)Microsoft	17.0.1050.2 to before 17.0.1135.8Affected

References

Microsoft SQL Server Security Feature Bypass Vulnerabilityvendor-advisorypatch

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