Microsoft SQL Server Elevation of Privilege Vulnerability

What privileges could be gained by an attacker who successfully exploited the vulnerability?
An attacker who successfully exploited this vulnerability could gain SQL sysadmin privileges.

How could an attacker exploit this vulnerability?
An authenticated attacker with explicit permissions could exploit the vulnerability by logging in to the SQL server and could then elevate their privileges to sysadmin.

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

I am running SQL Server on my system. What action do I need to take?
Update your relevant version of SQL Server using the applicable November 2026 security update listed below.
First, determine your SQL Server version number. For more information, see Microsoft Knowledge Base Article 321185 - How to determine the version, edition, and update level of SQL Server and its components., Second, locate the range containing your current version number in the following table. The corresponding update is the one you need to install.
5129299: 5129299, SQL Server 2025 CU10+GDR (November GDR 2026): SQL Server 2025 CU10+GDR (November GDR 2026), 17.0.5045.3: 17.0.5045.3, 17.0.4006.2 - 17.0.5035.5: 17.0.4006.2 - 17.0.5035.5, KB5125471 - SQL2025 RTM CU10: KB5125471 - SQL2025 RTM CU10, 5132748: 5132748, SQL Server 2025 RTM+GDR (November GDR 2026): SQL Server 2025 RTM+GDR (November GDR 2026), 17.0.1155.3: 17.0.1155.3, 17.0.1000.7 - 17.0.1145.4: 17.0.1000.7 - 17.0.1145.4, KB5128492 - Previous SQL2025 RTM GDR: KB5128492 - Previous SQL2025 RTM GDR, 5129300: 5129300, SQL Server 2022 CU27+GDR2 (November GDR 2026): SQL Server 2022 CU27+GDR2 (November GDR 2026), 16.0.4315.2: 16.0.4315.2, 16.0.4003.1 - 16.0.4305.5: 16.0.4003.1 - 16.0.4305.5, KB5126934 - SQL2022 RTM CU27 GDR: KB5126934 - SQL2022 RTM CU27 GDR, 5132747: 5132747, SQL Server 2022 RTM+GDR (November GDR 2026): SQL Server 2022 RTM+GDR (November GDR 2026), 16.0.1220.3: 16.0.1220.3, 16.0.1000.6 - 16.0.1210.3: 16.0.1000.6 - 16.0.1210.3, KB5128493 - Previous SQL2022 RTM GDR: KB5128493 - Previous SQL2022 RTM GDR, 5132745: 5132745, SQL Server 2019 CU32+GDR (November GDR 2026): SQL Server 2019 CU32+GDR (November GDR 2026), 15.0.4510.2: 15.0.4510.2, 15.0.4003.23 - 15.0.4500.2: 15.0.4003.23 - 15.0.4500.2, KB5128494 - Previous SQL2019 RTM CU32 GDR: KB5128494 - Previous SQL2019 RTM CU32 GDR, 5132751: 5132751, SQL Server 2019 RTM+GDR (November GDR 2026): SQL Server 2019 RTM+GDR (November GDR 2026), 15.0.2210.4: 15.0.2210.4, 15.0.2000.5 - 15.0.2200.2: 15.0.2000.5 - 15.0.2200.2, KB5128495 - Previous SQL2019 RTM GDR: KB5128495 - Previous SQL2019 RTM GDR, 5132746: 5132746, SQL Server 2017 CU31+GDR (November GDR 2026): SQL Server 2017 CU31+GDR (November GDR 2026), 14.0.3570.2: 14.0.3570.2, 14.0.3006.16 - 14.0.3560.2: 14.0.3006.16 - 14.0.3560.2, KB5128496 - Previous SQL2017 RTM CU31 GDR: KB5128496 - Previous SQL2017 RTM CU31 GDR, 5132749: 5132749, SQL Server 2017 RTM+GDR (November GDR 2026): SQL Server 2017 RTM+GDR (November GDR 2026), 14.0.2150.2: 14.0.2150.2, 14.0.1000.169 - 14.0.2140.2: 14.0.1000.169 - 14.0.2140.2, KB5128497 - Previous SQL2017 RTM GDR: KB5128497 - Previous SQL2017 RTM GDR
General Distribution Release (GDR) updates provide security and other broadly applicable critical fixes. Cumulative Updates (CUs) include accumulated fixes for the applicable SQL Server release. Use the version ranges above to select the security update for your installed servicing branch; CU+GDR updates apply to the listed CU branch, while RTM+GDR updates apply to the listed RTM/GDR branch.

Security updates
17.0.1155.3 — https://support.microsoft.com/help/5132748