CVE-2026-66819: CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') in Microsoft Microsoft SQL Server 2017 (CU 31)
Description
CVE-2026-66819 is a high-severity SQL injection vulnerability in Microsoft SQL Server 2017 (CU 31) that allows an authorized attacker to elevate privileges over a network by improper neutralization of special elements in SQL commands. The vulnerability affects multiple versions prior to specific fixed builds. An official fix is available from Microsoft.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft SQL Server 2017 (CU 31)
Microsoft
Microsoft SQL Server 2017 (GDR)
Microsoft
Microsoft SQL Server 2019 (CU 32)
Microsoft
Microsoft SQL Server 2019 (GDR)
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)
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-66819) involves improper neutralization of special elements used in SQL commands (SQL injection) in Microsoft SQL Server 2017 (CU 31). It enables an authorized attacker to elevate privileges remotely over a network. The CVSS 3.1 base score is 8.8, indicating high severity, with impacts on confidentiality, integrity, and availability. The vulnerability affects multiple versions of Microsoft SQL Server 2017 and later branches prior to their respective fixed builds. Microsoft has released an official fix for this issue.
Potential Impact
Successful exploitation allows an authorized attacker to elevate privileges on the affected SQL Server instance remotely, potentially leading to full compromise of the database server's confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66819 to remediate this vulnerability.
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-2026-66819","vendor":"Microsoft"}]
Threat ID: 6aa044c9acd9273b49fa7b2e
Added to database: 09/08/2026, 17:24:25 UTC
Last enriched: 10/16/2026, 20:40:10 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 41
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