CVE-2026-66814: high-severity vulnerability in Microsoft SQL Server 2017 (CU 31)
Microsoft SQL Server Elevation of Privilege Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 0.8%
Insufficient granularity of access control in SQL Server allows an authorized attacker to elevate privileges over a network.
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
Affected products
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)Related CVEs — Microsoft SQL Server 2017 (CU 31)
In the same product, most dangerous first.
CVE-2025-49719HIGHMicrosoft SQL Server Information Disclosure VulnerabilityEPSS 15.5%CVE-2021-1636HIGHMicrosoft SQL Elevation of Privilege VulnerabilityEPSS 6.7%CVE-2025-49718HIGHMicrosoft SQL Server Information Disclosure VulnerabilityEPSS 3.9%CVE-2024-37966HIGHMicrosoft SQL Server Native Scoring Information Disclosure VulnerabilityEPSS 2.2%CVE-2026-21262HIGHSQL Server Elevation of Privilege VulnerabilityEPSS 2.1%CVE-2022-29143HIGHMicrosoft SQL Server Remote Code Execution VulnerabilityEPSS 2.0%