Microsoft SQL Server Flaw Enables Network-Based Privilege Escalation

Cyberpress • January 14, 2026

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GDR updates contain only security fixes for a given baseline, while CU updates include both functional improvements and security patches .

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Microsoft SQL Server Vulnerability Allows Remote Privilege Escalation On January 13, 2026, Microsoft released security updates for a critical vulnerability in SQL Server, tracked as CVE-2026-20803. This flaw allows authorized attackers to bypass authentication controls and gain elevated privileges remotely due to missing authentication mechanisms in the database engine. Multiple SQL Server versions are affected by this vulnerability. 2 sources 40

Extracted Entities

Platforms (1)

Microsoft SQL Server