CVE-2026-66309 Azure SQL Database Elevation of Privilege Vulnerability

Critical 9.1 Published 20 Aug 2026 Updated 28 Oct 2026

An authorized attacker can elevate privileges in Azure SQL Database due to improper access control, requiring a patch to mitigate.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-66309?

CVE-2026-66309 is a critical vulnerability in Microsoft Azure SQL Database, published on 20 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Improper access control in Azure SQL Database allows an authorized attacker to elevate privileges over a network.

Weakness: CWE-284

Which versions are affected by CVE-2026-66309?

It affects 1 product.

Products include Microsoft Azure Sql Database.

How do I fix CVE-2026-66309?

No fix has been published for CVE-2026-66309 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-66309 being exploited?

There is no known exploitation of CVE-2026-66309 in the wild and no public exploit code.

Sources

Also known as GHSA-883f-j6q4-245q.