Vulnerability · Published Sep 8, 2026 · Assigned by microsoft
CVE-2026-66814Microsoft SQL Server Elevation of Privilege Vulnerability
High 8.8
In plain English
A high-severity security flaw in Microsoft SQL Server 2017 (CU 31) from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 44.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Insufficient granularity of access control in SQL Server allows an authorized attacker to elevate privileges over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SQL Server 2017 (CU 31) | 14.0.0 – before 14.0.3550.4 |
| Microsoft | Microsoft SQL Server 2017 (GDR) | 14.0.0 – before 14.0.2130.4 |
| Microsoft | Microsoft SQL Server 2019 (CU 32) | 15.0.0.0 – before 15.0.4490.9 |
| Microsoft | Microsoft SQL Server 2019 (GDR) | 15.0.0 – before 15.0.2190.7 |
| 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-1220 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Microsoft SQL Server Elevation of Privilege Vulnerability vendor-advisory, patch