Patch tracker / KB5097149

KB5097149

Microsoft security update released 2026-06-09. Fixes 3 CVEs.

High

Download KB5097149

Get the official update for KB5097149. The download and file size for each supported product are on the Microsoft Update Catalog page.

Microsoft Update Catalog: download KB5097149 Microsoft support article

Update summary

Released

2026-06-09

CVEs fixed

3

Max CVSS

7.8

Severity

High

Exploitation and severity

Fixes 3 CVEs. Most severe CVSS 7.8 (High). EPSS exploit probability up to 2.4%.

Among the lower half of tracked Microsoft updates by EPSS exploit probability.

What to do

Moderate priority: schedule it in your normal patch cycle. Senserva flags whether KB5097149 is missing on your devices.

CVEs fixed by this update

CVE-2026-45490 CVE-2026-45491 CVE-2026-45591

Affected products

.NET 10.0 installed on Windows
.NET 8.0 installed on Windows
.NET 9.0 installed on Windows

References

Microsoft support article Microsoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

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Lexicon: the terms on this page

CVE: Common Vulnerabilities and Exposures. A unique ID for one publicly known vulnerability, such as CVE-2025-1234.
KB: Microsoft Knowledge Base article. The identifier for a specific Microsoft update.
KEV: CISA Known Exploited Vulnerabilities. CVEs confirmed exploited in the wild. Fix these first.
CVSS: Common Vulnerability Scoring System. A standardized Severity score from 0 to 10.
EPSS: Exploit Prediction Scoring System. The probability a CVE will be exploited in the next 30 days.
MSRC: Microsoft Security Response Center. Microsoft's Patch Tuesday advisories and KB-to-CVE mapping.
NVD: National Vulnerability Database (NIST). Authoritative CVE metadata and CVSS scores.
Ransomware: The vulnerability is linked to known ransomware activity.