CVE-2026-20803 Details
Description
Missing authentication for critical function in SQL Server allows an authorized attacker to elevate privileges over a network.
A vulnerability in SQL Server allows an authorized attacker to bypass authentication for critical functions, enabling privilege escalation over the network. This issue affects SQL Server 2022 and 2025 on x64-based systems.
Users can update to the latest security patches available through the Microsoft Update Catalog. Specific update details can be found in the Microsoft Knowledge Base articles 5073177, 5072936, and 5073031.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jan 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20803 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft sql server 2022 | >= 16.0.1000.6, < 16.0.1165.1 >= 16.0.4003.1, < 16.0.4230.2 |
CPE
Remediation
| |
| microsoft sql server 2025 | 17.0.1000.7 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 30, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jan 16, 2026 | Initial Analysis | [email protected] |
| Jan 13, 2026 | New CVE Received | [email protected] |