CVE-2026-66816: CWE-778: Insufficient Logging in Microsoft Microsoft SQL Server 2022 (CU 26)
Description
CVE-2026-66816 is a vulnerability in Microsoft SQL Server 2022 (CU 26) involving insufficient logging. This flaw allows an authorized attacker to bypass a security feature over a network. The vulnerability has a medium severity rating with a CVSS score of 6.5. An official fix is available from Microsoft.
CVSS v3.1
Score 6.5medium
Affected software
Microsoft
Microsoft SQL Server 2022 (CU 26)
Microsoft
Microsoft SQL Server 2022 (GDR)
Microsoft
Microsoft SQL Server 2025 (CU8)
Microsoft
Microsoft SQL Server 2025 for x64-based Systems (GDR)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-66816 in Microsoft SQL Server 2022 (CU 26) is due to insufficient logging mechanisms. This weakness enables an attacker with authorized access to bypass certain security features remotely. The CVSS 3.1 base score is 6.5, indicating medium severity, with network attack vector, low attack complexity, and requiring privileges but no user interaction. Microsoft has issued an official fix for this vulnerability.
Potential Impact
An authorized attacker can exploit this insufficient logging vulnerability to bypass security features remotely, potentially compromising confidentiality. There is no impact on integrity or availability reported. No known exploits are currently active in the wild.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users should apply the provided security updates as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66816 to remediate the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-27T19:02:26.601Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66816","vendor":"Microsoft"}]
Threat ID: 6aa044c7acd9273b49fa7b07
Added to database: 09/08/2026, 17:24:23 UTC
Last enriched: 10/16/2026, 20:50:00 UTC
Last updated: 10/22/2026, 13:15:23 UTC
Views: 51
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