Microsoft SQL Server Vulnerability Allows Attackers to Elevate Privileges over a Network
Microsoft has issued security updates on Tue, Jan 13, 2026, to address a critical elevation of privilege vulnerability in SQL Server . This vulnerability, identified as CVE-2026-20803, allows authorized attackers to bypass authentication controls and…
Microsoft has issued security updates on Tue, Jan 13, 2026, to address a critical elevation of privilege vulnerability in SQL Server . This vulnerability, identified as CVE-2026-20803, allows authorized attackers to bypass authentication controls and remotely gain elevated system privileges.
The vulnerability arises from missing authentication mechanisms for critical functions within the database engine. It affects multiple versions of SQL Server, including SQL Server 2022 and the recently released SQL Server 2025. Microsoft has classified this vulnerability as having an “Important” severity with a CVSS score of 7.2.
The attack requires high privileges and network access, but once exploited, it grants attackers significant capabilities, including memory dumping and debugging access. This flaw could potentially lead to further system compromise.
Microsoft has issued security updates on Tue, Jan 13, 2026, to address a critical elevation of privilege vulnerability in SQL Server .
The vulnerability allows authenticated users with elevated permissions to escalate their access beyond intended boundaries without user interaction. An attacker exploiting this flaw can gain debugging privileges, dump sensitive memory contents, and potentially access encrypted data or extract database credentials stored in memory.
While the exploitability assessment is “Less Likely,” indicating specific preconditions, Microsoft has not reported active exploitation or public disclosure attempts. Security updates are available through General Distribution Release (GDR) and Cumulative Update (CU) pathways. Organizations using SQL Server 2022 should apply either CU22 (build 16.0.4230.2) or RTM GDR (build 16.0.1165.1) updates, while SQL Server 2025 users must install the January GDR update (build 17.0.1050.2).
Organizations should prioritize patching systems in internet-facing environments or those handling sensitive data. Microsoft advises reviewing deployment architectures and restricting administrative access to mitigate exploitation risks during update windows. Further details and updates can be accessed through the Microsoft Security Response Center .
Based on reporting by Cyber Security News.