NVD

CVE-2026-20803 Detail

Description

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

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

Nist CVSS score does not match with CNA score

CNA: Microsoft Corporation

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20803	Microsoft Corporation	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-306	Missing Authentication for Critical Function	Microsoft Corporation

Known Affected Software Configurations Switch to CPE 2.2

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Change History

5 change records found show changes

CVE Modified by Microsoft Corporation 7/30/2026 5:16:56 PM

Action

Type

Old Value

New Value

Changed

Affected

[{"vendor":"Microsoft","product":"Microsoft SQL Server 2022 (GDR)","platforms":["x64-based Systems"],"versions":[{"version":"16.0.0","lessThan":"16.0.1165.1","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft SQL Server 2022 for x64-based Systems (CU 22)","versions":[{"version":"16.0.0.0","lessThan":"16.0.4230.2","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft SQL Server 2025 for x64-based Systems (GDR)","versions":[{"version":"17.0.1050.2","lessThan":"17.0.1050.2","versionType":"custom","status":"affected"}]}]

[{"vendor":"Microsoft","product":"Microsoft SQL Server 2022 (GDR)","platforms":["x64-based Systems"],"versions":[{"version":"16.0.0","lessThan":"16.0.1165.1","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft SQL Server 2022 for x64-based Systems (CU 22)","versions":[{"version":"16.0.0.0","lessThan":"16.0.4230.2","versionType":"custom","status":"affected"}]},{"vendor":"Microsoft","product":"Microsoft SQL Server 2025 for x64-based Systems (GDR)","platforms":["x64-based Systems"],"versions":[{"version":"17.0.1050.2","lessThan":"17.0.1050.2","versionType":"custom","status":"affected"}]}]

New CVE Received from Microsoft Corporation 1/13/2026 1:16:06 PM

Action	Type	New Value
Added	Description	Missing authentication for critical function in SQL Server allows an authorized attacker to elevate privileges over a network.
Added	CVSS V3.1	AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-306
Added	Reference	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20803

Quick Info

CVE Dictionary Entry:
CVE-2026-20803
NVD Published Date:
01/13/2026
NVD Last Modified:
07/30/2026
Source:
Microsoft Corporation

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Information Technology Laboratory

National Vulnerability Database