Microsoft SQL Server Vulnerability Allows Attackers to Elevate Privileges over a Network

Cybersecuritynews •Abinaya • January 15, 2026

Microsoft released security updates on January 13, 2026, addressing a critical elevation of privilege vulnerability in SQL Server that enables authorized attackers to bypass authentication controls and gain elevated system privileges remotely. Tracked as CVE-2026-20803, the vulnerability stems from missing authentication mechanisms for critical functions within the database engine. The flaw affects multiple SQL Server […]

The full story

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

CVEs (1)

CVE-2026-20803

Platforms (1)

SQL Server