SQL Server Elevation of Privilege Vulnerability

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 October 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.
5126967: 5126967, SQL Server 2025 CU9+GDR (October GDR 2026): SQL Server 2025 CU9+GDR (October GDR 2026), 17.0.5015.4: 17.0.5015.4, 17.0.4006.2 - 17.0.5005.3: 17.0.4006.2 - 17.0.5005.3, KB5122048 - SQL2025 RTM CU9: KB5122048 - SQL2025 RTM CU9, 5128492: 5128492, SQL Server 2025 RTM+GDR (October GDR 2026): SQL Server 2025 RTM+GDR (October GDR 2026), 17.0.1145.4: 17.0.1145.4, 17.0.1000.7 - 17.0.1135.8: 17.0.1000.7 - 17.0.1135.8, KB5122770 - Previous SQL2025 RTM GDR: KB5122770 - Previous SQL2025 RTM GDR, 5126934: 5126934, SQL Server 2022 CU27+GDR1 (October GDR 2026): SQL Server 2022 CU27+GDR1 (October GDR 2026), 16.0.4305.5: 16.0.4305.5, 16.0.4003.1 - 16.0.4295.3: 16.0.4003.1 - 16.0.4295.3, KB5104824 - SQL2022 RTM CU27: KB5104824 - SQL2022 RTM CU27, 5128493: 5128493, SQL Server 2022 RTM+GDR (October GDR 2026): SQL Server 2022 RTM+GDR (October GDR 2026), 16.0.1210.3: 16.0.1210.3, 16.0.1000.6 - 16.0.1200.5: 16.0.1000.6 - 16.0.1200.5, KB5122771 - Previous SQL2022 RTM GDR: KB5122771 - Previous SQL2022 RTM GDR, 5128494: 5128494, SQL Server 2019 CU32+GDR (October GDR 2026): SQL Server 2019 CU32+GDR (October GDR 2026), 15.0.4500.2: 15.0.4500.2, 15.0.4003.23 - 15.0.4490.9: 15.0.4003.23 - 15.0.4490.9, KB5122772 - Previous SQL2019 RTM CU32 GDR: KB5122772 - Previous SQL2019 RTM CU32 GDR, 5128495: 5128495, SQL Server 2019 RTM+GDR (October GDR 2026): SQL Server 2019 RTM+GDR (October GDR 2026), 15.0.2200.2: 15.0.2200.2, 15.0.2000.5 - 15.0.2190.7: 15.0.2000.5 - 15.0.2190.7, KB5122773 - Previous SQL2019 RTM GDR: KB5122773 - Previous SQL2019 RTM GDR, 5128496: 5128496, SQL Server 2017 CU31+GDR (October GDR 2026): SQL Server 2017 CU31+GDR (October GDR 2026), 14.0.3560.2: 14.0.3560.2, 14.0.3006.16 - 14.0.3550.4: 14.0.3006.16 - 14.0.3550.4, KB5122774 - Previous SQL2017 RTM CU31 GDR: KB5122774 - Previous SQL2017 RTM CU31 GDR, 5128497: 5128497, SQL Server 2017 RTM+GDR (October GDR 2026): SQL Server 2017 RTM+GDR (October GDR 2026), 14.0.2140.2: 14.0.2140.2, 14.0.1000.169 - 14.0.2130.4: 14.0.1000.169 - 14.0.2130.4, KB5122775 - Previous SQL2017 RTM GDR: KB5122775 - 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.

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.

I am running SQL Server on my system. What action do I need to take?
Update your relevant version of SQL Server. Any applicable driver fixes are included in those updates.
First, determine your SQL Server version number. For more information on determining your SQL Server version number, see Microsoft Knowledge Base Article 321185 - How to determine the version, edition, and update level of SQL Server and its components., Second, in the following table, locate your version number or the version range that your version number falls within. The corresponding update is the one you need to install.
5083245: 5083245, Security update for SQL Server 2025 CU3+GDR: Security update for SQL Server 2025 CU3+GDR, 17.0.4030.1: 17.0.4030.1, 17.0.4006.2 - 17.0.4025.3: 17.0.4006.2 - 17.0.4025.3, KB5077896 - Previous SQL2025 RTM CU3: KB5077896 - Previous SQL2025 RTM CU3, 5084814: 5084814, Security update for SQL Server 2025 RTM+GDR: Security update for SQL Server 2025 RTM+GDR, 17.0.1110.1: 17.0.1110.1, 17.0.1000.7 - 17.0.1105.2: 17.0.1000.7 - 17.0.1105.2, KB5077468 - Previous SQL2025 RTM GDR: KB5077468 - Previous SQL2025 RTM GDR, 5083252: 5083252, Security update for SQL Server 2022 CU24+GDR: Security update for SQL Server 2022 CU24+GDR, 16.0.4250.1: 16.0.4250.1, 16.0.4003.1 - 16.0.4245.2: 16.0.4003.1 - 16.0.4245.2, KB5080999 - Previous SQL2022 RTM CU24: KB5080999 - Previous SQL2022 RTM CU24, 5084815: 5084815, Security update for SQL Server 2022 RTM+GDR: Security update for SQL Server 2022 RTM+GDR, 16.0.1175.1: 16.0.1175.1, 16.0.1000.6 - 16.0.1170.5: 16.0.1000.6 - 16.0.1170.5, KB5077465 - Previous SQL2022 RTM GDR: KB5077465 - Previous SQL2022 RTM GDR, 5084816: 5084816, Security update for SQL Server 2019 CU32+GDR: Security update for SQL Server 2019 CU32+GDR, 15.0.4465.1: 15.0.4465.1, 15.0.4003.23 - 15.0.4460.4: 15.0.4003.23 - 15.0.4460.4, KB 5077469 - Previous SQL2019 RTM CU32 GDR: KB 5077469 - Previous SQL2019 RTM CU32 GDR, 5084817: 5084817, Security update for SQL Server 2019 RTM+GDR: Security update for SQL Server 2019 RTM+GDR, 15.0.2165.1: 15.0.2165.1, 15.0.2000.5 - 15.0.2160.4: 15.0.2000.5 - 15.0.2160.4, KB 5077470 - Previous SQL2019 RTM GDR: KB 5077470 - Previous SQL2019 RTM GDR, 5084818: 5084818, Security update for SQL Server 2017 CU31+GDR: Security update for SQL Server 2017 CU31+GDR, 14.0.3525.1: 14.0.3525.1, 14.0.3006.16 - 14.0.3520.4: 14.0.3006.16 - 14.0.3520.4, KB 5077471 - Previous SQL2017 RTM CU31 GDR: KB 5077471 - Previous SQL2017 RTM CU31 GDR, 5084819: 5084819, Security update for SQL Server 2017 RTM+GDR: Security update for SQL Server 2017 RTM+GDR, 14.0.2105.1: 14.0.2105.1, 14.0.1000.169 - 14.0.2100.4: 14.0.1000.169 - 14.0.2100.4, KB 5077472 - Previous SQL2017 RTM GDR: KB 5077472 - Previous SQL2017 RTM GDR, 5084820: 5084820, Security update for SQL Server 2016 Azure Connect Feature Pack+GDR: Security update for SQL Server 2016 Azure Connect Feature Pack+GDR, 13.0.7080.1: 13.0.7080.1, 13.0.7000.253 - 13.0.7075.5: 13.0.7000.253 - 13.0.7075.5, KB 5077473 - Previous SQL2016 Azure Connect Feature Pack GDR: KB 5077473 - Previous SQL2016 Azure Connect Feature Pack GDR, 5084821: 5084821, Security update for SQL Server 2016 SP3+GDR: Security update for SQL Server 2016 SP3+GDR, 13.0.6485.1: 13.0.6485.1, 13.0.6300.2 - 13.0.6480.4: 13.0.6300.2 - 13.0.6480.4, KB 5077474 - Previous SQL2016 RTM GDR: KB 5077474 - Previous SQL2016 RTM GDR
The General Distribution Release (GDR) and Cumulative Update (CU) designations correspond to the two different servicing options in place for SQL Server baseline releases. A baseline can be either an RTM release or a Service Pack release.
GDR updates – cumulatively only contain security updates for the given baseline., CU updates – cumulatively contain all functional fixes and security updates for the given baseline.
For any given baseline, either the GDR or CU updates could be options (see below).
If SQL Server installation is at a baseline version, you can choose either the GDR or CU update., If SQL Server installation has intentionally only installed past GDR updates, then choose to install the GDR update package., If SQL Server installation has intentionally installed previous CU updates, then choose to install the CU security update package.
Yes. SQL Server instances on Windows Azure (IaaS) can be offered the security updates through Microsoft Update, or customers can download the security updates from Microsoft Download Center and apply them manually.

Security updates
16.0.4305.5 — https://support.microsoft.com/help/5126934
14.0.3560.2 — https://support.microsoft.com/help/5128496
17.0.5015.4 — https://support.microsoft.com/help/5126967
17.0.4030.1 — https://support.microsoft.com/help/5083245
17.0.1110.1 — https://support.microsoft.com/help/5084814
17.0.1145.4 — https://support.microsoft.com/help/5128492
16.0.4250.1 — https://support.microsoft.com/help/5083252
14.0.2105.1 — https://support.microsoft.com/help/5084819
14.0.2140.2 — https://support.microsoft.com/help/5128497
15.0.2165.1 — https://support.microsoft.com/help/5084817
15.0.2200.2 — https://support.microsoft.com/help/5128495
13.0.6485.1 — https://support.microsoft.com/help/5084821
13.0.7080.1 — https://support.microsoft.com/help/5084820
14.0.3525.1 — https://support.microsoft.com/help/5084818
16.0.1175.1 — https://support.microsoft.com/help/5084815
16.0.1210.3 — https://support.microsoft.com/help/5128493
15.0.4465.1 — https://support.microsoft.com/help/5084816
15.0.4500.2 — https://support.microsoft.com/help/5128494