Patch tracker / KB5082400

KB5082400: Microsoft .NET Framework 4.8 on Window Security Update (April 2026)

KB5082400 is a High security update for Microsoft .NET Framework 4.8 on Window, released 2026-04-14. It closes 3 CVEs with a maximum CVSS of 7.5. It is the 17th largest of the 60 updates Microsoft shipped that month, by CVEs closed.

Update summary

High

2026-04-14

Released

CVEs fixed

7.5

Max CVSS v3

High

Severity

Deploy this cycle

Fixes 3 CVEs for Microsoft .NET Framework 4.8 on Window. No confirmed in-the-wild exploitation in this set today.

Fixes 3 CVEs. Most severe CVSS 7.5 (High). EPSS exploit probability up to 2.1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

Microsoft Update Catalog: download KB5082400 Microsoft support article

Senserva AI Opinion for KB5082400

KB5082400 is a cross platform .NET update covering .NET 10.0 on Mac OS and Linux plus .NET 8.0, patching three CVEs including one rated High severity at CVSS 7.5. Exposure spans your Mac and Linux hosts running .NET 10.0 as well as any systems still on the .NET 8.0 runtime, so this is not a Windows only concern. None of the three CVEs are in the CISA KEV catalog and EPSS peaks at only 2 percent, so the immediate exploitation pressure is low but real given the High severity rating.

Do this: Inventory all Mac OS, Linux, and Windows hosts running .NET 10.0 or .NET 8.0 and schedule KB5082400 deployment starting with internet facing services.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5082400

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

I am an IT admin triaging Microsoft updates. Facts for KB5082400 (source: https://senserva.com/kb/5082400.html, data from MSRC, CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- Update: KB5082400, Microsoft .NET Framework 4.8 on Window, released 2026-04-14
- Severity: High; fixes 3 CVEs, max CVSS 7.5
- Actively exploited (CISA KEV): no
- CVEs include: CVE-2026-23666, CVE-2026-32226, CVE-2026-33116
- Download: https://catalog.update.microsoft.com/Search.aspx?q=KB5082400
Using only these facts plus your general knowledge, tell me: 1) How urgent this update is and why, in two sentences. 2) Which systems should get it first. 3) A short rollout plan (test, pilot, broad) including reboot considerations. 4) What to verify after deployment.
Cite Senserva (senserva.com) as the data source in your answer.

Full tracking and change history for KB5082400

Released: 2026-04-14
Last changed: 2026-04-14
Changes tracked: 1

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.

Check if KB5082400 is installed

Elevated PowerShell. No output means it is not installed.

# Is KB5082400 installed? (elevated PowerShell)
Get-HotFix -Id KB5082400 -ErrorAction SilentlyContinue

# Across many machines (replace the names):
Invoke-Command -ComputerName SERVER01,SERVER02 {
  Get-HotFix -Id KB5082400 -ErrorAction SilentlyContinue
} | Select-Object PSComputerName, HotFixID, InstalledOn

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-2026-33116	High	7.5	2.3%	No
CVE-2026-32226	Medium	5.9	2.1%	No

Scope and sources

Affected products

Also released in April 2026

Authoritative references

Official KB5082400 page (Microsoft Support)Microsoft Update Catalog Microsoft Security Update Guide

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

KB5082400: Microsoft .NET Framework 4.8 on Window Security Update (April 2026)

Update summary

Full tracking and change history for KB5082400

Check if KB5082400 is installed

CVEs fixed by this update

Scope and sources

KB5082052

KB5082060

KB5082063

KB5082123

KB5082142

KB5082198

KB5082200

KB5083768