Access Control Flaw in SQL Server by Microsoft
CVE-2026-77480

8.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Sql Server 2017 (cu 31)
Microsoft Sql Server 2017 (gdr)
Microsoft Sql Server 2019 (cu 32)
Microsoft Sql Server 2019 (gdr)
Vendor
CVE Published:
8 September 2026

What is CVE-2026-77480?

An access control vulnerability in SQL Server permits an attacker with authorization to escalate their privileges across a network. This allows for potentially unauthorized actions within the database environment, highlighting the need for immediate attention to access restrictions in SQL Server configurations. Organizations using affected versions should implement patches and review their security policies to mitigate risks associated with unauthorized privilege escalation.

Affected Version(s)

Microsoft SQL Server 2017 (CU 31) x64-based Systems 14.0.0 < 14.0.3550.4

Microsoft SQL Server 2017 (GDR) x64-based Systems 14.0.0 < 14.0.2130.4

Microsoft SQL Server 2019 (CU 32) x64-based Systems 15.0.0.0 < 15.0.4490.9

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.