Microsoft SQL Server Elevation of Privilege Vulnerability

Date Sep 8, 2026

Type Patch Tuesday

Signal High-risk advisory

Vendor / Product Microsoft · SQL Server

CVE CVE-2026-66819

High-risk advisory CVE-2026-66819

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. Published in September 2026 Security Updates. MSRC exploitability: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely.

Why it matters

Microsoft published this item through its Security Update Guide, making it part of Patch Tuesday triage for affected Windows, cloud, or application estates.

Operator check

Review the Microsoft Security Update Guide entry for CVE-2026-66819. Confirm whether SQL Server is deployed, then apply the current security update or documented mitigation. CVSS score: 8.8.

Sources

MSRC 2026-Sep Security Update Guide NVD — CVE-2026-66819 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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