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

criticalCVSS 9.1CVE-2026-66309
Improper access control in Azure SQL Database allows an authorized attacker to elevate privileges over a network.

CSIRTS triage

vendor: Microsoftproduct: Azure SQL DatabasePrivilege escalation
What
Improper access control allows authorized attackers to elevate privileges over a network.
Who is affected
Azure SQL Database deployments with authorized users are affected.
Urgency
Critical severity (CVSS 9.1) requires immediate patching despite no known exploitation.
Action
Apply Microsoft security update for Azure SQL Database access controls.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
critical — CVSS 9.1
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66309

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-66309coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Azure SQL Database

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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