What is CVE-2026-20803?

CVE-2026-20803 is a high-severity vulnerability in Microsoft Sql Server 2022 For X64-based Systems (Cu 22), classified under Missing Authentication for Critical Function. CVSS score: 7.2/10. Published 2026-01-13.

How severe is CVE-2026-20803?

High severity. CVSS v3 base score is 7.2 out of 10.

Auth bypass in Microsoft Sql Server 2022 For X64-based Systems (Cu 22)

CVE-2026-20803

Missing authentication for critical function in SQL Server allows an authorized attacker to elevate privileges over a network.

Vulnerability class: Broken Authentication

EPSS: 0.001 (25.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C.

Affected products

Microsoft Sql Server 2022 For X64-based Systems (Cu 22) — versions 16.0.0.0
Microsoft Sql Server 2022 (Gdr) — versions 16.0.0
Microsoft Sql Server 2025 For X64-based Systems (Gdr) — versions 17.0.1050.2

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

Microsoft SQL Server Elevation of Privilege Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-20803?: CVE-2026-20803 is a high-severity vulnerability in Microsoft Sql Server 2022 For X64-based Systems (Cu 22), classified under Missing Authentication for Critical Function. CVSS score: 7.2/10. Published 2026-01-13.
How severe is CVE-2026-20803?: High severity. CVSS v3 base score is 7.2 out of 10.