CVE-2026-66309: CWE-284: Improper Access Control in Microsoft Azure SQL Database
CVE-2026-66309 is a critical vulnerability in Microsoft Azure SQL Database involving improper access control. It allows an authorized attacker to elevate privileges over a network, potentially compromising confidentiality, integrity, and availability. Microsoft has issued an official fix for this cloud service vulnerability.
AI Analysis
Technical Summary
This vulnerability, identified as CVE-2026-66309 and categorized under CWE-284 (Improper Access Control), affects Microsoft Azure SQL Database. It permits an attacker with existing authorization to escalate privileges remotely, impacting the security of the database service. The CVSS v3.1 base score is 9.1, indicating critical severity with network attack vector, low attack complexity, high privileges required, no user interaction, and complete impact on confidentiality, integrity, and availability. Microsoft manages remediation for this cloud-hosted service and has released an official fix as documented in their security update guide.
Potential Impact
An authorized attacker can elevate privileges remotely within Azure SQL Database, leading to full compromise of data confidentiality, integrity, and availability. This could allow unauthorized access to sensitive data and disruption of database operations.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. As this is a cloud service, Microsoft manages the remediation server-side. Users should verify that their Azure SQL Database instances are updated according to Microsoft's advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66309 to ensure protection.
CVE-2026-66309: CWE-284: Improper Access Control in Microsoft Azure SQL Database
Description
CVE-2026-66309 is a critical vulnerability in Microsoft Azure SQL Database involving improper access control. It allows an authorized attacker to elevate privileges over a network, potentially compromising confidentiality, integrity, and availability. Microsoft has issued an official fix for this cloud service vulnerability.
CVSS v3.1
Score 9.1critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-66309 and categorized under CWE-284 (Improper Access Control), affects Microsoft Azure SQL Database. It permits an attacker with existing authorization to escalate privileges remotely, impacting the security of the database service. The CVSS v3.1 base score is 9.1, indicating critical severity with network attack vector, low attack complexity, high privileges required, no user interaction, and complete impact on confidentiality, integrity, and availability. Microsoft manages remediation for this cloud-hosted service and has released an official fix as documented in their security update guide.
Potential Impact
An authorized attacker can elevate privileges remotely within Azure SQL Database, leading to full compromise of data confidentiality, integrity, and availability. This could allow unauthorized access to sensitive data and disruption of database operations.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. As this is a cloud service, Microsoft manages the remediation server-side. Users should verify that their Azure SQL Database instances are updated according to Microsoft's advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66309 to ensure protection.
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: 08/20/2026, 22:39:06 UTC
Last updated: 08/20/2026, 23:32:07 UTC
Views: 5
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