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

High 8.8 Published 8 Sep 2026 Updated 14 Oct 2026

An authorized attacker can exploit SQL injection in Microsoft SQL Server to elevate privileges over the network.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-66819?

CVE-2026-66819 is a high-severity SQL injection vulnerability in Microsoft Sql Server 2017, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-89

Which versions are affected by CVE-2026-66819?

It affects 4 products.

Products include Microsoft Sql Server 2017, Microsoft Sql Server 2019, Microsoft Sql Server 2022, Microsoft Sql Server 2025.

How do I fix CVE-2026-66819?

No fix has been published for CVE-2026-66819 yet. Limit exposure of the affected software until one is available.

Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.

Is CVE-2026-66819 being exploited?

There is no known exploitation of CVE-2026-66819 in the wild and no public exploit code.

All Microsoft Sql Server 2017 vulnerabilities

Sources

Also known as GHSA-9c22-76g9-f83j.