CVE-2026-66819 — Microsoft SQL Server Elevation of Privilege Vulnerability

Executive Summary

Improper neutralization of special elements used in an sql command ('sql injection') in SQL Server allows an authorized attacker to elevate privileges over a network.

Overview

8.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Elevation of Privilege

Weakness CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Released Sep 8 2026

Last Updated Sep 8 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.7

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

8 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft SQL Server 2017 for x64-based Systems (CU 31)	`5122774 (Security Update)`	Important	Elevation of Privilege	Yes
Microsoft SQL Server 2017 for x64-based Systems (GDR)	`5122775 (Security Update)`	Important	Elevation of Privilege	Yes
Microsoft SQL Server 2019 for x64-based Systems (CU 32)	`5122772 (Security Update)`	Important	Elevation of Privilege	Yes
Microsoft SQL Server 2019 for x64-based Systems (GDR)	`5122773 (Security Update)`	Important	Elevation of Privilege	Yes
Microsoft SQL Server 2022 for x64-based Systems (CU 26)	`5122768 (Security Update)`	Important	Elevation of Privilege	Yes
Microsoft SQL Server 2022 for x64-based Systems (GDR)	`5122771 (Security Update)`	Important	Elevation of Privilege	Yes
Microsoft SQL Server 2025 for x64-based Systems (CU8)	`5122769 (Security Update)`	Important	Elevation of Privilege	Yes
Microsoft SQL Server 2025 for x64-based Systems (GDR)	`5122770 (Security Update)`	Important	Elevation of Privilege	Yes

Patches

8 patches

Article	Type	Restart
`5122774`	Security Update	Yes
`5122775`	Security Update	Yes
`5122772`	Security Update	Yes
`5122773`	Security Update	Yes
`5122768`	Security Update	Yes
`5122771`	Security Update	Yes
`5122769`	Security Update	Yes
`5122770`	Security Update	Yes

Exploits & PoC

No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

Fabiano Amorim
Sharath Unni

References

MSRC Advisory MITRE NVD