Vulnerability · Published Sep 8, 2026 · Assigned by microsoft
CVE-2026-66816Microsoft SQL Server Security Feature Bypass Vulnerability
Medium 6.5
In plain English
A medium-severity security flaw in Microsoft SQL Server 2022 (CU 26) from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 63% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)1.0%top 37.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SQL Server 2022 (CU 26) | 16.0.0.0 – before 16.0.4275.2 |
| Microsoft | Microsoft SQL Server 2022 (GDR) | 16.0.0 – before 16.0.1200.5 |
| Microsoft | Microsoft SQL Server 2025 (CU8) | 17.0.0.0 – before 17.0.4085.5 |
| Microsoft | Microsoft SQL Server 2025 for x64-based Systems (GDR) | 17.0.1050.2 – before 17.0.1135.8 |
Weakness: CWE-778 · Vector: 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
References
- Microsoft SQL Server Security Feature Bypass Vulnerability vendor-advisory, patch