CVE-2026-66818
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Improper Privilege Escalation in SQL Server

Vulnerability report for CVE-2026-66818, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-09-08

Last updated on: 2026-09-09

Assigner: Microsoft Corporation

Description

Improper privilege management in SQL Server allows an authorized attacker to elevate privileges over a network.

CVSS Scores

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Meta Information

Published
2026-09-08
Last Modified
2026-09-09
Generated
2026-09-09
AI Q&A
2026-09-09
EPSS Evaluated
N/A
NVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft sql_server *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-269 The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

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Executive Summary

This is an improper privilege management flaw in Microsoft SQL Server. An authorized attacker can exploit it over a network to gain elevated privileges, potentially allowing them to perform unauthorized actions or access sensitive data.

Impact Analysis

If you use Microsoft SQL Server, an attacker could exploit this to gain higher access levels than intended. This may lead to data breaches, unauthorized modifications, or system compromise, depending on the attacker's goals.

Compliance Impact

This vulnerability could lead to unauthorized access or exposure of sensitive data, violating compliance requirements like GDPR or HIPAA. Organizations may face penalties or legal consequences if such breaches occur due to inadequate security measures.

Mitigation Strategies

Apply the latest security updates from Microsoft for SQL Server immediately to address improper privilege management. Review and restrict user permissions to minimize potential privilege escalation risks. Monitor network traffic for unusual SQL Server activity and unauthorized privilege changes.

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