CVE intelligence

CVE-2026-40410

Vulnerability intelligence

Published May 12, 2026Sources checked Nov 11, 2026

7.0HIGHCVSS out of 10

What this means

Review the available evidence

CVE-2026-40410 and is rated High severity with a CVSS score of 7.0. 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: May 12, 2026

Vendor remediation details

Install KB5087538. Install KB5087545. Install KB5087424. Install KB5087544. Install KB5094127. Install KB5087539. Install KB5087423. Install KB5089549. Install KB5089466. Install KB5087420. Install KB5093998. Install KB5087541. Install KB5089548. Install KB5087537. Install KB5087471.

Vendor-listed releases

10.0.17763.8755
10.0.20348.5139
10.0.20348.5074
10.0.19044.7291
10.0.19045.7417
10.0.26100.32860
10.0.26100.32772
10.0.26200.8457
10.0.26200.8390
10.0.22631.7079
10.0.22631.7219
10.0.25398.2330
10.0.26100.8457
10.0.26100.8390
10.0.28000.2113
10.0.14393.9140
6.3.9600.23181

CISA KEVNot listedBased on the latest collected catalog

EPSS0.2%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-40410?

Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally.

Source: NVD