CVE intelligence

CVE-2026-66816

Vulnerability intelligence

Published Sep 8, 2026Sources checked Oct 28, 2026

6.5MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-66816 and is rated Medium severity with a CVSS score of 6.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Sep 8, 2026

Vendor remediation details

Install KB5122771. Install KB5122770. Install KB5122769. Install KB5122768.

Vendor-listed releases

16.0.1200.5
17.0.1135.8
17.0.4085.5
16.0.4275.2

CISA KEVNot listedBased on the latest collected catalog

EPSS1.0%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-66816?

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

Source: NVD