CVE-2026-20803 Microsoft SQL Server Elevation of Privilege Vulnerability
An authorized attacker can elevate privileges over the network due to missing authentication for a critical function in Microsoft SQL Server.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20803?
CVE-2026-20803 is a high-severity missing authorization vulnerability in Microsoft Sql Server 2022, published on 13 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Missing authentication for critical function in SQL Server allows an authorized attacker to elevate privileges over a network.
Weakness: CWE-306
Which versions are affected by CVE-2026-20803?
It affects 2 products.
Products include Microsoft Sql Server 2022, Microsoft Sql Server 2025.
How do I fix CVE-2026-20803?
No fix has been published for CVE-2026-20803 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-20803 being exploited?
There is no known exploitation of CVE-2026-20803 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sql Server 2022
- CVE-2026-67643 Microsoft SQL Server Remote Code Execution Vulnerability
- CVE-2026-78456 SQL Server Remote Code Execution Vulnerability
- CVE-2025-47954 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-66816 Microsoft SQL Server Security Feature Bypass Vulnerability
- CVE-2026-67389 Microsoft SQL Server Information Disclosure Vulnerability
Sources
Also known as GHSA-9429-3r47-rwh9.