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CVE-2026-66816— Microsoft SQL Server Security Feature Bypass Vulnerability

Quick assessment

Affected
Microsoft Microsoft SQL Server 2022 (CU 26)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft SQL Server是美国Microsoft公司的一套应用在Microsoft Windows系统下的大型商业数据库系统。 Microsoft SQL Server 2022 (CU 26) 16.0.4275.2之前版本、Microsoft SQL Server 2022 (GDR) 16.0.1200.5之前版本、Microsoft SQL Server 2025 (CU8) 17.0.4085.5之前版本和Microsoft SQL Server 2025 for x64-bas

CVSS 6.5 · Medium EPSS 1.00% · P62

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 4

VendorProduct Version RangeStatus
Microsoft Microsoft SQL Server 2022 (CU 26) 16.0.0.0< 16.0.4275.2 affected
Microsoft Microsoft SQL Server 2022 (GDR) 16.0.0< 16.0.1200.5 affected
Microsoft Microsoft SQL Server 2025 (CU8) 17.0.0.0< 17.0.4085.5 affected
Microsoft Microsoft SQL Server 2025 for x64-based Systems (GDR) 17.0.1050.2< 17.0.1135.8 affected
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I. Basic Information for CVE-2026-66816

Vulnerability Information
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Vulnerability Title
Microsoft SQL Server Security Feature Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的日志记录
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft SQL Server 日志信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft SQL Server是美国Microsoft公司的一套应用在Microsoft Windows系统下的大型商业数据库系统。 Microsoft SQL Server 2022 (CU 26) 16.0.4275.2之前版本、Microsoft SQL Server 2022 (GDR) 16.0.1200.5之前版本、Microsoft SQL Server 2025 (CU8) 17.0.4085.5之前版本和Microsoft SQL Server 2025 for x64-bas
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-66816

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III. Intelligence Information for CVE-2026-66816

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Vendor Advisories for CVE-2026-66816 (1)

Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total

CVE-2026-83941 9.9 CRITICAL Entra ID Elevation of Privilege Vulnerability
CVE-2026-77493 9.8 CRITICAL Windows Graphics Component Remote Code Execution Vulnerability
CVE-2026-69493 9.8 CRITICAL Windows Event Logging Service Remote Code Execution Vulnerability
CVE-2026-69824 9.8 CRITICAL Microsoft Standard XPS Remote Code Execution Vulnerability
CVE-2026-68839 9.8 CRITICAL Windows USB Mass Storage Class Driver Remote Code Execution Vulnerability
CVE-2026-70296 9.8 CRITICAL Windows Imaging Component Remote Code Execution Vulnerability
CVE-2026-78509 9.8 CRITICAL Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-69768 9.8 CRITICAL Windows RNDIS Remote Code Execution Vulnerability
CVE-2026-73009 9.8 CRITICAL Windows Secure Socket Tunneling Protocol (SSTP) Remote Code Execution Vulnerability
CVE-2026-73010 9.8 CRITICAL Microsoft Failover Cluster Remote Code Execution Vulnerability
CVE-2026-67643 9.8 CRITICAL Microsoft SQL Server Remote Code Execution Vulnerability
CVE-2026-69463 9.8 CRITICAL Windows NTFS Remote Code Execution Vulnerability
CVE-2026-72979 9.8 CRITICAL Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-69496 9.8 CRITICAL Windows Compressed Folder Remote Code Execution Vulnerability
CVE-2026-69586 9.8 CRITICAL Microsoft Windows PDF Remote Code Execution Vulnerability
CVE-2026-69590 9.8 CRITICAL Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-69276 9.8 CRITICAL Microsoft UxTheme Library (uxtheme.dll) Remote Code Execution Vulnerability
CVE-2026-72982 9.8 CRITICAL Windows Netlogon Remote Code Execution Vulnerability
CVE-2026-69525 9.8 CRITICAL Remote Desktop Services Remote Code Execution Vulnerability
CVE-2026-69579 9.8 CRITICAL Windows Message Queuing Remote Code Execution Vulnerability

Showing top 20 of 966 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft SQL Server 2022 (CU 26)
Same vendor: Microsoft
Same weakness: CWE-778

V. Comments for CVE-2026-66816

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