Missing Authentication for Critical Function in Microsoft SQL Server - CVE-2026-20803
Published: January 13, 2026
Vulnerability identifier: #VU121347
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20803
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Microsoft SQL Server
Microsoft SQL Server
Detailed vulnerability description
The vulnerability allows a remote user to compromise the target system.
The vulnerability exists due to missing authentication for critical function in Microsoft SQL Server. A remote administrator can gain elevated privileges on the target system.
How to mitigate CVE-2026-20803
Install updates from vendor's website.