Junglewise Threat Intelligence

CVE-2026-66816: Microsoft SQL Server insufficient logging allows security feature bypass

CVE-2026-66816 · Severity: medium · CVSS 6.5 · Published 2026-09-08

Technologies: Microsoft SQL Server. Vendors: Microsoft.

Executive brief

SQL Server is a database platform used to store and manage critical business data. An authenticated attacker could exploit insufficient logging to bypass a security feature, potentially allowing unauthorized access to sensitive data or operations while evading detection.

Technical details

The vulnerability stems from insufficient logging in SQL Server, which allows an authorized attacker to circumvent a security feature via network access. An attacker with valid database credentials can exploit this logging gap to perform unauthorized operations without generating adequate audit trails. The attack requires prior authentication and network connectivity to the SQL Server instance. Mitigation involves applying the security updates provided by Microsoft.

Affected products

  • Microsoft SQL Server

Timeline

  • 2026-09-08: disclosed

References

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