Patch tracker / KB5082406
KB5082406: Microsoft .NET Framework 4.8 on Window Security Update (April 2026)
KB5082406 is a High security update for Microsoft .NET Framework 4.8 on Window, released 2026-04-14. It closes 2 CVEs with a maximum CVSS of 7.5. Get it from the Microsoft Update Catalog below, and see where it sits against the rest of the month on the patch tracker.
Update summary
New to these terms? How the Microsoft patching tools fit together, this month's Patch Tuesday summary, and every update ranked by real-world risk.
Senserva AI Opinion for KB5082406
KB5082406 patches two CVEs in .NET Framework 4.8 running on Windows 10 Version 1607 (32-bit and x64) and Windows Server 2012, both of which are older platforms often kept on extended support for legacy workloads. The highest issue rates High severity at CVSS 7.5, but EPSS is only 1 percent and neither CVE-2026-23666 nor CVE-2026-32226 appears in CISA KEV or is ransomware-linked. The practical concern here is that 1607 and Server 2012 hosts tend to run business-critical .NET applications that are slow to reboot and easy to overlook in patch cycles.
Do this: Identify which 1607 and Server 2012 machines still run .NET Framework 4.8 and schedule KB5082406 in your next maintenance window.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5082406
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5082406
Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.
Exploitation and severity
Fixes 2 CVEs. Most severe CVSS 7.5 (High). EPSS exploit probability up to 1.3%.
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 KB5082406 is missing on your devices.
Check if KB5082406 is installed
Copy-paste PowerShell: one machine, or your whole estate in one pass. No output means the update is not installed.
Get-HotFix covers Windows updates. Office, SharePoint, and Exchange server updates show under installed updates in Programs and Features, or check the Update Catalog history.
CVEs fixed by this update
Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-23666 | High | 7.5 | 2.1% | No |
| CVE-2026-32226 | High | 7.5 | 2.1% | No |
Affected products
Also released in April 2026
The highest-risk updates from the same release:
The full month, summarized: Microsoft Patch Tuesday.
Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.