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: 0.012 (65.9th 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.
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
- Microsoft Sql_server_2022
- Microsoft Sql_server_2025 — versions 17.0.1000.7
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
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.