CVE-2026-66816

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Insufficient Logging Bypass in SQL Server

Publication date: 2026-09-08

Last updated on: 2026-09-16

Assigner: Microsoft Corporation

Description

Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-08

Last Modified

2026-09-16

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-66816

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sql_server_2022	to 16.0.1200.5 (exc)
microsoft	sql_server_2022	From 16.0.4003.1 (inc) to 16.0.4275.2 (exc)
microsoft	sql_server_2025	to 17.0.1135.8 (exc)
microsoft	sql_server_2025	From 17.0.4006.2 (inc) to 17.0.4085.5 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-778	When a security-critical event occurs, the product either does not record the event or omits important details about the event when logging it.

Attack-Flow Graph

Executive Summary

This vulnerability involves insufficient logging in SQL Server, which allows an authorized attacker to bypass a security feature over a network. The issue does not require user interaction and can lead to high confidentiality impact as sensitive data may be accessed without detection.

Impact Analysis

An attacker could exploit this to bypass security controls and access sensitive data without leaving a trace in logs. This could result in unauthorized data exposure, data theft, or further compromise of the database environment.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR and HIPAA due to insufficient logging and potential unauthorized data access. Both regulations require robust logging and protection of personal data, which this flaw undermines.

Mitigation Strategies

Apply the latest security updates from Microsoft for SQL Server to address insufficient logging issues. Monitor network traffic for unusual SQL queries or unauthorized access attempts. Enable comprehensive logging and review logs regularly to detect bypass attempts.

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