CVE-2026-66309: CWE-284: Improper Access Control in Microsoft Azure SQL Database
Description
Improper access control in Azure SQL Database allows an authorized attacker to elevate privileges over a network.
CVSS v3.1
Score 9.1critical
Affected software
Microsoft
Azure SQL Database
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-66309) in Azure SQL Database is categorized as CWE-284 (Improper Access Control). It enables an authorized attacker to elevate privileges remotely over the network, impacting confidentiality, integrity, and availability with a critical severity score of 9.1. The vulnerability affects the cloud-hosted Azure SQL Database service. Microsoft has published an official fix and manages remediation for this cloud service.
Potential Impact
An authorized attacker can exploit this vulnerability to elevate their privileges within Azure SQL Database, potentially gaining unauthorized access to sensitive data and control over database operations. The impact includes complete compromise of confidentiality, integrity, and availability of the affected service.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability and manages remediation for the Azure SQL Database cloud service. Users should ensure their Azure SQL Database instances are updated according to Microsoft's guidance available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66309. No additional user action beyond applying the official fix is required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-24T18:06:51.295Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66309","vendor":"Microsoft"}]
Threat ID: 6a87778aacd9273b492c5eac
Added to database: 08/20/2026, 21:54:18 UTC
Last enriched: 09/29/2026, 02:55:38 UTC
Last updated: 10/05/2026, 06:48:18 UTC
Views: 49
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