CVE-2026-66813: Microsoft SQL Server Elevation of Privilege Vulnerability

CVE-2026-66813 is an elevation of privilege vulnerability in Microsoft SQL Server, rated Important by Microsoft, with a CVSS 3.1 base score of 8.1 (High). An attacker can exploit it remotely over the network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. Microsoft released the fix on 10 November 2026 in the November 2026 Patch Tuesday, delivered through 8 security updates (KB5132749, KB5132751, KB5132747, KB5132748 and more). It affects 8 products in 1 product family (SQL Server).

Key facts

CVE ID

CVE-2026-66813

Severity

High CVSS 8.1

Microsoft severity

Important

Impact

Elevation of Privilege

Exploited in the wild

No

Publicly disclosed

No

Exploitation likelihood

Less Likely

CISA KEV

Not listed

Released

10 November 2026

Last updated

10 November 2026

Patch Tuesday

November 2026 Patch Tuesday

Product families

SQL Server

CVSS score and vector

Microsoft scores CVE-2026-66813 at 8.1 (temporal 7.1) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Description

Out-of-bounds read in SQL Server allows an unauthorized attacker to elevate privileges over a network.

Frequently asked questions (Microsoft)

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires an attacker to have a deep understanding of the system. Successful exploitation is not guaranteed and depends on a combination of factors that might include the environment, system configuration, and the presence of additional security measures.

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 the vulnerability?

An attacker who successfully exploited this vulnerability could gain SQL sysadmin privileges.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?

Successful exploitation of this vulnerability requires an attacker to chain other vulnerabilities in order to successfully gain unauthorized access to the target environment.

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.

There are GDR and/or CU (Cumulative Update) updates offered for my version of SQL Server. How do I know which update to use?

• 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.

Note: If your version is not represented in the table, review the applicable update's prerequisites and the support status of your SQL Server release before choosing an update. Absence from this table alone does not establish that a version is unsupported.

Update Number

Title

Version

Apply if current product version is…

This security update also includes servicing releases up through…

5129299

SQL Server 2025 CU10+GDR (November GDR 2026)

17.0.5045.3

17.0.4006.2 - 17.0.5035.5

KB5125471 - SQL2025 RTM CU10

5132748

SQL Server 2025 RTM+GDR (November GDR 2026)

17.0.1155.3

17.0.1000.7 - 17.0.1145.4

KB5128492 - Previous SQL2025 RTM GDR

5129300

SQL Server 2022 CU27+GDR2 (November GDR 2026)

16.0.4315.2

16.0.4003.1 - 16.0.4305.5

KB5126934 - SQL2022 RTM CU27 GDR

5132747

SQL Server 2022 RTM+GDR (November GDR 2026)

16.0.1220.3

16.0.1000.6 - 16.0.1210.3

KB5128493 - Previous SQL2022 RTM GDR

5132745

SQL Server 2019 CU32+GDR (November GDR 2026)

15.0.4510.2

15.0.4003.23 - 15.0.4500.2

KB5128494 - Previous SQL2019 RTM CU32 GDR

5132751

SQL Server 2019 RTM+GDR (November GDR 2026)

15.0.2210.4

15.0.2000.5 - 15.0.2200.2

KB5128495 - Previous SQL2019 RTM GDR

5132746

SQL Server 2017 CU31+GDR (November GDR 2026)

14.0.3570.2

14.0.3006.16 - 14.0.3560.2

KB5128496 - Previous SQL2017 RTM CU31 GDR

5132749

SQL Server 2017 RTM+GDR (November GDR 2026)

14.0.2150.2

14.0.1000.169 - 14.0.2140.2

KB5128497 - Previous SQL2017 RTM GDR

What are the GDR and CU update designations and how do they differ?

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.

Affected products (8)

SQL Server

Security updates (8)

• KB5132749 (Security Update)
• KB5132751 (Security Update)
• KB5132747 (Security Update)
• KB5132748 (Security Update)
• KB5129300 (Security Update)
• KB5129299 (Security Update)
• KB5132745 (Security Update)
• KB5132746 (Security Update)

Acknowledgments

• Joe Ponce-Galindo with Microsoft

Revision history

Related vulnerabilities

Other Microsoft SQL Server vulnerabilities

• CVE-2026-116945: Microsoft SQL Server Remote Code Execution Vulnerability (Critical, CVSS 9.8)
• CVE-2026-94513: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8)
• CVE-2026-84010: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 7.5)
• CVE-2026-67646: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-67637: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-67632: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-67391: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-67387: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8.8)
• CVE-2026-67375: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8.8)
• CVE-2026-67374: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-67372: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-118120: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8.8)

More from the November 2026 Patch Tuesday

• CVE-2026-116930: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-116934: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8.8)
• CVE-2026-116941: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-116942: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-116946: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.8)
• CVE-2026-118105: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8.8)
• CVE-2026-118109: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8.8)
• CVE-2026-118110: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8.8)
• CVE-2026-70003: JDBC Driver for SQL Server Security Feature Bypass Vulnerability (High, CVSS 8.7)
• CVE-2026-118106: Microsoft SQL Server Remote Code Execution Vulnerability (High, CVSS 8.1)
• CVE-2026-118111: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8)
• CVE-2026-118112: Microsoft SQL Server Elevation of Privilege Vulnerability (High, CVSS 8)

All vulnerabilities of this release: November 2026 Patch Tuesday · November 2026 briefing

Sources

• Microsoft Security Update Guide: CVE-2026-66813
• NIST NVD: CVE-2026-66813
• CVE.org record: CVE-2026-66813