CVE-2026-20803

Microsoft SQL Server Elevation of Privilege Vulnerability

Published Jan 13, 2026 CVSS 3.1 · 7.2 High EPSS 1.2% KEV · Not listed
Description
Missing authentication for critical function in SQL Server allows an authorized attacker to elevate privileges over a network.

Analysis

AI-generated

Technical impact

The vulnerability is a missing authentication check for a critical function in Microsoft SQL Server. An attacker who already has authorized access can invoke this function to attain higher privileges within the database engine. The description does not give details beyond privilege escalation, and no broader data access is explicitly indicated.

Affected Systems

Microsoft SQL Server 2022 (GDR) and the x64-based version with CU 22, as well as Microsoft SQL Server 2025 (GDR). The affected releases include the 17.0.1000.7 build for the x64 platform.

Risk and Exploitability

The CVSS score is 7.2, reflecting a high severity, while the EPSS score is 1%, indicating that exploitation is unlikely to be widely observed. The vulnerability is not listed in the CISA KEV catalog, further suggesting low exploit visibility. The likely attack vector is remote network-based. Once the attacker has authenticated to SQL Server, they can invoke the vulnerable function and gain privileges beyond those originally granted.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Download and install the security update for Microsoft SQL Server 2022 and 2025 that addresses CVE‑2026‑20803 from Microsoft’s update guide.
  • Review database role permissions and ensure only necessary users have the roles that can invoke the vulnerable function, applying the principle of least privilege.
  • Apply network segmentation and firewall rules to limit exposure of SQL Server to trusted subnets and reduce the attack surface for privilege escalation.

Generated by OpenCVE AI on June 18, 2026 at 05:59 UTC.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
CPEs cpe:2.3:a:microsoft:sql_server_2025:17.0.1000.7:*:*:*:*:*:x64:*
Type Values Removed Values Added
Description Missing authentication for critical function in SQL Server allows an authorized attacker to elevate privileges over a network.
Title Microsoft SQL Server Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft sql Server 2022
Microsoft sql Server 2025
Weaknesses CWE-306
CPEs cpe:2.3:a:microsoft:sql_server_2022:*:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server_2025:*:*:*:*:*:*:x64:*
Vendors & Products Microsoft
Microsoft sql Server 2022
Microsoft sql Server 2025
References
Metrics cvssV3_1

{'score': 7.2, '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'}

Weaknesses
  • CWE-306

    Missing Authentication for Critical Function

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Jul 30, 2026, 8:46 PM
Reserved
Dec 3, 2025, 5:54 AM
Status
Analyzed
Published
Jan 13, 2026, 6:16 PM
Modified
Jul 30, 2026, 9:16 PM