Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-20803

Severity CVSS v4.0:
Pending analysis
Type:
CWE-306 Missing Authentication for Critical Function
Publication date:
13/01/2026
Last modified:
16/01/2026

Description

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

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.20 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.20
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:microsoft:sql_server_2022:*:*:*:*:*:*:x64:* 16.0.1000.6 (including) 16.0.1165.1 (excluding)
cpe:2.3:a:microsoft:sql_server_2022:*:*:*:*:*:*:x64:* 16.0.4003.1 (including) 16.0.4230.2 (excluding)
cpe:2.3:a:microsoft:sql_server_2025:17.0.1000.7:*:*:*:*:*:x64:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools